gui-cs.Terminal.Gui/Tests/UnitTests/Views/TextViewTests.cs

using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using UnitTests;
using Xunit.Abstractions;

namespace UnitTests.ViewsTests;

public class TextViewTests
{
    private static TextView _textView;
    private readonly ITestOutputHelper _output;
    public TextViewTests (ITestOutputHelper output) { _output = output; }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void AllowsReturn_Setting_To_True_Changes_Multiline_To_True_If_It_Is_False ()
    {
        Assert.True (_textView.AllowsReturn);
        Assert.True (_textView.Multiline);
        Assert.Equal (4, _textView.TabWidth);
        Assert.True (_textView.AllowsTab);
        _textView.NewKeyDownEvent (Key.Enter);

        Assert.Equal (
                      Environment.NewLine + "TAB to jump between text fields.",
                      _textView.Text
                     );

        _textView.AllowsReturn = false;
        Assert.False (_textView.AllowsReturn);
        Assert.False (_textView.Multiline);
        Assert.Equal (0, _textView.TabWidth);
        Assert.False (_textView.AllowsTab);
        _textView.NewKeyDownEvent (Key.Enter);

        Assert.Equal (
                      Environment.NewLine + "TAB to jump between text fields.",
                      _textView.Text
                     );
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void AllowsTab_Setting_To_True_Changes_TabWidth_To_Default_If_It_Is_Zero ()
    {
        _textView.TabWidth = 0;
        Assert.Equal (0, _textView.TabWidth);
        Assert.True (_textView.AllowsTab);
        Assert.True (_textView.AllowsReturn);
        Assert.True (_textView.Multiline);
        _textView.AllowsTab = true;
        Assert.True (_textView.AllowsTab);
        Assert.Equal (4, _textView.TabWidth);
        Assert.True (_textView.AllowsReturn);
        Assert.True (_textView.Multiline);
    }
    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void CanFocus_False_Wont_Focus_With_Mouse ()
    {
        Toplevel top = new ();
        var tv = new TextView { Width = Dim.Fill (), CanFocus = false, ReadOnly = true, Text = "some text" };

        var fv = new FrameView
        {
            Width = Dim.Fill (), Height = Dim.Fill (), CanFocus = false, Title = "I shouldn't get focus"
        };
        fv.Add (tv);
        top.Add (fv);

        Application.Begin (top);

        Assert.False (tv.CanFocus);
        Assert.False (tv.HasFocus);
        Assert.False (fv.CanFocus);
        Assert.False (fv.HasFocus);

        tv.NewMouseEvent (new () { Position = new (1, 0), Flags = MouseFlags.Button1DoubleClicked });

        Assert.Empty (tv.SelectedText);
        Assert.False (tv.CanFocus);
        Assert.False (tv.HasFocus);
        Assert.False (fv.CanFocus);
        Assert.False (fv.HasFocus);

        fv.CanFocus = true;
        tv.CanFocus = true;
        tv.NewMouseEvent (new () { Position = new (1, 0), Flags = MouseFlags.Button1DoubleClicked });

        Assert.Equal ("some ", tv.SelectedText);
        Assert.True (tv.CanFocus);
        Assert.True (tv.HasFocus);
        Assert.True (fv.CanFocus);
        Assert.True (fv.HasFocus);

        fv.CanFocus = false;
        tv.NewMouseEvent (new () { Position = new (1, 0), Flags = MouseFlags.Button1DoubleClicked });

        Assert.Equal ("some ", tv.SelectedText); // Setting CanFocus to false don't change the SelectedText
        Assert.True (tv.CanFocus); // v2: CanFocus is not longer automatically changed
        Assert.False (tv.HasFocus);
        Assert.False (fv.CanFocus);
        Assert.False (fv.HasFocus);
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Changing_Selection_Or_CursorPosition_Update_SelectedLength_And_SelectedText ()
    {
        _textView.SelectionStartColumn = 2;
        _textView.SelectionStartRow = 0;
        Assert.Equal (0, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (2, _textView.SelectedLength);
        Assert.Equal ("TA", _textView.SelectedText);
        _textView.CursorPosition = new (20, 0);
        Assert.Equal (2, _textView.SelectionStartColumn);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (18, _textView.SelectedLength);
        Assert.Equal ("B to jump between ", _textView.SelectedText);
    }

    [Fact]
    [SetupFakeApplication]
    public void ContentsChanged_Event_Fires_On_Init ()
    {
        Application.StopAfterFirstIteration = true;

        var expectedRow = 0;
        var expectedCol = 0;
        var eventcount = 0;

        var tv = new TextView { Width = 50, Height = 10 };

        tv.ContentsChanged += (s, e) =>
                              {
                                  eventcount++;
                                  Assert.Equal (expectedRow, e.Row);
                                  Assert.Equal (expectedCol, e.Col);
                              };

        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);
        Assert.Equal (1, eventcount);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void ContentsChanged_Event_Fires_On_InsertText ()
    {
        var eventcount = 0;

        var tv = new TextView { Width = 50, Height = 10 };
        tv.CursorPosition = Point.Empty;

        tv.ContentsChanged += (s, e) => { eventcount++; };

        Assert.Equal (0, eventcount);

        tv.InsertText ("a");
        Assert.Equal (1, eventcount);

        tv.CursorPosition = Point.Empty;
        tv.InsertText ("bcd");
        Assert.Equal (4, eventcount);

        tv.InsertText ("e");
        Assert.Equal (5, eventcount);

        tv.InsertText ("\n");
        Assert.Equal (6, eventcount);

        tv.InsertText ("1234");
        Assert.Equal (10, eventcount);
    }

    [Fact]
    [SetupFakeApplication]
    public void ContentsChanged_Event_Fires_On_Set_Text ()
    {
        Application.StopAfterFirstIteration = true;
        var eventcount = 0;

        var expectedRow = 0;
        var expectedCol = 0;

        var tv = new TextView
        {
            Width = 50,
            Height = 10,

            // you'd think col would be 3, but it's 0 because TextView sets
            // row/col = 0 when you set Text
            Text = "abc"
        };

        tv.ContentsChanged += (s, e) =>
                              {
                                  eventcount++;
                                  Assert.Equal (expectedRow, e.Row);
                                  Assert.Equal (expectedCol, e.Col);
                              };

        Assert.Equal ("abc", tv.Text);

        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        Assert.Equal (1, eventcount); // for Initialize

        expectedCol = 0;
        tv.Text = "defg";
        Assert.Equal (2, eventcount); // for set Text = "defg"
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void ContentsChanged_Event_Fires_On_Typing ()
    {
        Application.StopAfterFirstIteration = true;
        var eventcount = 0;

        var expectedRow = 0;
        var expectedCol = 0;

        var tv = new TextView { Width = 50, Height = 10 };

        tv.ContentsChanged += (s, e) =>
                              {
                                  eventcount++;
                                  Assert.Equal (expectedRow, e.Row);
                                  Assert.Equal (expectedCol, e.Col);
                              };

        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        Assert.Equal (1, eventcount); // for Initialize

        expectedCol = 0;
        tv.Text = "ay";
        Assert.Equal (2, eventcount);

        expectedCol = 1;
        tv.NewKeyDownEvent (Key.Y.WithShift);
        Assert.Equal (3, eventcount);
        Assert.Equal ("Yay", tv.Text);
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void ContentsChanged_Event_Fires_On_Undo_Redo ()
    {
        var eventcount = 0;
        var expectedEventCount = 0;

        _textView.ContentsChanged += (s, e) => { eventcount++; };

        expectedEventCount++;
        _textView.Text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount++;
        Assert.True (_textView.NewKeyDownEvent (Key.Enter));
        Assert.Equal (expectedEventCount, eventcount);

        // Undo
        expectedEventCount++;
        Assert.True (_textView.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal (expectedEventCount, eventcount);

        // Redo
        expectedEventCount++;
        Assert.True (_textView.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal (expectedEventCount, eventcount);

        // Undo
        expectedEventCount++;
        Assert.True (_textView.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal (expectedEventCount, eventcount);

        // Redo
        expectedEventCount++;
        Assert.True (_textView.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal (expectedEventCount, eventcount);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void ContentsChanged_Event_Fires_Using_Copy_Or_Cut_Tests ()
    {
        var eventcount = 0;

        _textView.ContentsChanged += (s, e) => { eventcount++; };

        var expectedEventCount = 1;

        // reset
        _textView.Text = TextViewTestsSetupFakeApplication.Txt;
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 3;
        Copy_Or_Cut_And_Paste_With_No_Selection ();
        Assert.Equal (expectedEventCount, eventcount);

        // reset
        expectedEventCount += 1;
        _textView.Text = TextViewTestsSetupFakeApplication.Txt;
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 3;
        Copy_Or_Cut_And_Paste_With_Selection ();
        Assert.Equal (expectedEventCount, eventcount);

        // reset
        expectedEventCount += 1;
        _textView.Text = TextViewTestsSetupFakeApplication.Txt;
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 1;
        Copy_Or_Cut_Not_Null_If_Has_Selection ();
        Assert.Equal (expectedEventCount, eventcount);

        // reset
        expectedEventCount += 1;
        _textView.Text = TextViewTestsSetupFakeApplication.Txt;
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 1;
        Copy_Or_Cut_Null_If_No_Selection ();
        Assert.Equal (expectedEventCount, eventcount);

        // reset
        expectedEventCount += 1;
        _textView.Text = TextViewTestsSetupFakeApplication.Txt;
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 4;
        Copy_Without_Selection ();
        Assert.Equal (expectedEventCount, eventcount);

        // reset
        expectedEventCount += 1;
        _textView.Text = TextViewTestsSetupFakeApplication.Txt;
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 4;
        Copy_Without_Selection ();
        Assert.Equal (expectedEventCount, eventcount);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void ContentsChanged_Event_Fires_Using_Kill_Delete_Tests ()
    {
        var eventcount = 0;

        _textView.ContentsChanged += (s, e) => { eventcount++; };

        var expectedEventCount = 1;
        Kill_Delete_WordForward ();
        Assert.Equal (expectedEventCount, eventcount); // for Initialize

        expectedEventCount += 1;
        Kill_Delete_WordBackward ();
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 2;
        Kill_To_End_Delete_Forwards_Copy_To_The_Clipboard_And_Paste ();
        Assert.Equal (expectedEventCount, eventcount);

        expectedEventCount += 2;
        Kill_To_Start_Delete_Backwards_Copy_To_The_Clipboard_And_Paste ();
        Assert.Equal (expectedEventCount, eventcount);
    }

    [Fact]
    [SetupFakeApplication]
    public void ContentsChanged_Event_NoFires_On_CursorPosition ()
    {
        var eventcount = 0;

        var tv = new TextView { Width = 50, Height = 10 };

        tv.ContentsChanged += (s, e) => { eventcount++; };
        Assert.Equal (0, eventcount);

        tv.CursorPosition = Point.Empty;

        Assert.Equal (0, eventcount);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Copy_Or_Cut_And_Paste_With_No_Selection ()
    {
        _textView.SelectionStartColumn = 20;
        _textView.SelectionStartRow = 0;
        _textView.CursorPosition = new (24, 0);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("text", _textView.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.SelectionStartColumn = 0;
        _textView.SelectionStartRow = 0;
        Assert.Equal (new (24, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        _textView.IsSelecting = false;
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste
        Assert.Equal (new (28, 0), _textView.CursorPosition);
        Assert.False (_textView.IsSelecting);
        Assert.Equal ("TAB to jump between texttext fields.", _textView.Text);
        _textView.SelectionStartColumn = 24;
        _textView.SelectionStartRow = 0;
        _textView.NewKeyDownEvent (Key.W.WithCtrl); // Cut
        Assert.Equal (new (24, 0), _textView.CursorPosition);
        Assert.False (_textView.IsSelecting);
        Assert.Equal ("", _textView.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.SelectionStartColumn = 0;
        _textView.SelectionStartRow = 0;
        _textView.IsSelecting = false;
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste
        Assert.Equal (new (28, 0), _textView.CursorPosition);
        Assert.False (_textView.IsSelecting);
        Assert.Equal ("TAB to jump between texttext fields.", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Copy_Or_Cut_And_Paste_With_Selection ()
    {
        _textView.SelectionStartColumn = 20;
        _textView.SelectionStartRow = 0;
        _textView.CursorPosition = new (24, 0);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("text", _textView.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.SelectionStartColumn = 20;
        _textView.SelectionStartRow = 0;
        _textView.NewKeyDownEvent (Key.W.WithCtrl); // Cut
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Copy_Or_Cut_Not_Null_If_Has_Selection ()
    {
        _textView.SelectionStartColumn = 20;
        _textView.SelectionStartRow = 0;
        _textView.CursorPosition = new (24, 0);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("text", _textView.SelectedText);
        _textView.NewKeyDownEvent (Key.W.WithCtrl); // Cut
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Copy_Or_Cut_Null_If_No_Selection ()
    {
        _textView.SelectionStartColumn = 0;
        _textView.SelectionStartRow = 0;
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("", _textView.SelectedText);
        _textView.NewKeyDownEvent (Key.W.WithCtrl); // Cut
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Copy_Paste_Surrogate_Pairs ()
    {
        _textView.Text = "TextView with some more test text. Unicode shouldn't 𝔹Aℝ𝔽!";
        _textView.SelectAll ();
        _textView.Cut ();

        Assert.Equal (
                      "TextView with some more test text. Unicode shouldn't 𝔹Aℝ𝔽!",
                      Application.Driver?.Clipboard.GetClipboardData ()
                     );
        Assert.Equal (string.Empty, _textView.Text);
        _textView.Paste ();
        Assert.Equal ("TextView with some more test text. Unicode shouldn't 𝔹Aℝ𝔽!", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Copy_Without_Selection ()
    {
        _textView.Text = "This is the first line.\nThis is the second line.\n";
        _textView.CursorPosition = new (0, _textView.Lines - 1);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}{Environment.NewLine}",
                      _textView.Text
                     );
        _textView.CursorPosition = new (3, 1);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the second line.{Environment.NewLine}{Environment.NewLine}",
                      _textView.Text
                     );
        Assert.Equal (new (3, 2), _textView.CursorPosition);
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the second line.{Environment.NewLine}{Environment.NewLine}",
                      _textView.Text
                     );
        Assert.Equal (new (3, 3), _textView.CursorPosition);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Cursor_Position_Multiline_False_Initialization ()
    {
        Assert.False (_textView.IsInitialized);
        Assert.True (_textView.Multiline);
        _textView.Multiline = false;
        Assert.Equal (32, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.Equal ("", _textView.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void CursorPosition_With_Value_Greater_Than_Text_Length_Changes_To_Text_Length ()
    {
        _textView.CursorPosition = new (33, 1);
        Assert.Equal (32, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void CursorPosition_With_Value_Less_Than_Zero_Changes_To_Zero ()
    {
        _textView.CursorPosition = new (-1, -1);
        Assert.Equal (0, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Cut_Not_Allowed_If_ReadOnly_Is_True ()
    {
        _textView.ReadOnly = true;
        _textView.SelectionStartColumn = 20;
        _textView.SelectionStartRow = 0;
        _textView.CursorPosition = new (24, 0);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("text", _textView.SelectedText);

        _textView.NewKeyDownEvent (
                                   Key.W.WithCtrl
                                  ); // Selecting is set to false after Cut.
        Assert.Equal ("", _textView.SelectedText);
        _textView.ReadOnly = false;
        Assert.False (_textView.IsSelecting);
        _textView.IsSelecting = true; // Needed to set Selecting to true.
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("text", _textView.SelectedText);
        _textView.NewKeyDownEvent (Key.W.WithCtrl); // Cut
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [SetupFakeApplication]
    public void DeleteTextBackwards_WordWrap_False_Return_Undo ()
    {
        const string text = "This is the first line.\nThis is the second line.\n";
        var tv = new TextView { Width = Dim.Fill (), Height = Dim.Fill (), Text = text };
        string envText = tv.Text;
        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.False (tv.WordWrap);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is the first line. 
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (3, 0);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (2, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (0, 1);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (22, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.This is the second line.
",
                                                       _output
                                                      );

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (0, 1), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        while (tv.Text != envText)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (envText, tv.Text);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.False (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void DeleteTextBackwards_WordWrap_True_Return_Undo ()
    {
        const string text = "This is the first line.\nThis is the second line.\n";
        var tv = new TextView { Width = Dim.Fill (), Height = Dim.Fill (), Text = text, WordWrap = true };
        string envText = tv.Text;
        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.True (tv.WordWrap);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is the first line. 
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (3, 0);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (2, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (0, 1);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (22, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.This is the second line.
",
                                                       _output
                                                      );

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (0, 1), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        while (tv.Text != envText)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        SetupFakeApplicationAttribute.RunIteration ();

        Assert.Equal (envText, tv.Text);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.False (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void DeleteTextForwards_WordWrap_False_Return_Undo ()
    {
        const string text = "This is the first line.\nThis is the second line.\n";
        var tv = new TextView { Width = Dim.Fill (), Height = Dim.Fill (), Text = text };
        string envText = tv.Text;
        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.False (tv.WordWrap);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is the first line. 
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (2, 0);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Delete));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (2, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (22, 0);
        Assert.Equal (new (22, 0), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Delete));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (22, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.This is the second line.
",
                                                       _output
                                                      );

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (0, 1), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        while (tv.Text != envText)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (envText, tv.Text);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.False (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void DeleteTextForwards_WordWrap_True_Return_Undo ()
    {
        const string text = "This is the first line.\nThis is the second line.\n";
        var tv = new TextView { Width = Dim.Fill (), Height = Dim.Fill (), Text = text, WordWrap = true };
        string envText = tv.Text;
        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.True (tv.WordWrap);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is the first line. 
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (2, 0);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Delete));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (2, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        tv.CursorPosition = new (22, 0);
        Assert.Equal (new (22, 0), tv.CursorPosition);
        Assert.True (tv.NewKeyDownEvent (Key.Delete));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (22, 0), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.This is the second line.
",
                                                       _output
                                                      );

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (0, 1), tv.CursorPosition);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Ths is the first line.  
This is the second line.
",
                                                       _output
                                                      );

        while (tv.Text != envText)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        SetupFakeApplicationAttribute.RunIteration ();

        Assert.Equal (envText, tv.Text);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.False (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void DesiredCursorVisibility_Horizontal_Navigation ()
    {
        var text = "";

        for (var i = 0; i < 12; i++)
        {
            text += $"{i.ToString () [^1]}";
        }

        var tv = new TextView { Width = 10, Height = 10 };
        tv.Text = text;
        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (0, tv.LeftColumn);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Application.PositionCursor ();
        Assert.Equal (CursorVisibility.Default, tv.CursorVisibility);

        for (var i = 0; i < 12; i++)
        {
            tv.NewMouseEvent (new () { Flags = MouseFlags.WheeledRight });
            Assert.Equal (Math.Min (i + 1, 11), tv.LeftColumn);
            Application.PositionCursor ();
            Application.Driver!.GetCursorVisibility (out CursorVisibility cursorVisibility);
            Assert.Equal (CursorVisibility.Invisible, cursorVisibility);
        }

        for (var i = 11; i > 0; i--)
        {
            tv.NewMouseEvent (new () { Flags = MouseFlags.WheeledLeft });
            Assert.Equal (i - 1, tv.LeftColumn);

            Application.PositionCursor ();
            Application.Driver!.GetCursorVisibility (out CursorVisibility cursorVisibility);

            if (i - 1 == 0)
            {
                Assert.Equal (CursorVisibility.Default, cursorVisibility);
            }
            else
            {
                Assert.Equal (CursorVisibility.Invisible, cursorVisibility);
            }
        }

        top.Dispose ();
        Application.Shutdown ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void DesiredCursorVisibility_Vertical_Navigation ()
    {
        var text = "";

        for (var i = 0; i < 12; i++)
        {
            text += $"This is the line {i}\n";
        }

        var tv = new TextView { Width = 10, Height = 10 };
        tv.Text = text;
        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (0, tv.TopRow);
        Application.PositionCursor ();
        Assert.Equal (CursorVisibility.Default, tv.CursorVisibility);

        for (var i = 0; i < 12; i++)
        {
            tv.NewMouseEvent (new () { Flags = MouseFlags.WheeledDown });
            Application.PositionCursor ();
            Assert.Equal (i + 1, tv.TopRow);
            Application.Driver!.GetCursorVisibility (out CursorVisibility cursorVisibility);
            Assert.Equal (CursorVisibility.Invisible, cursorVisibility);
        }

        for (var i = 12; i > 0; i--)
        {
            tv.NewMouseEvent (new () { Flags = MouseFlags.WheeledUp });
            Application.PositionCursor ();
            Assert.Equal (i - 1, tv.TopRow);

            Application.PositionCursor ();
            Application.Driver!.GetCursorVisibility (out CursorVisibility cursorVisibility);

            if (i - 1 == 0)
            {
                Assert.Equal (CursorVisibility.Default, cursorVisibility);
            }
            else
            {
                Assert.Equal (CursorVisibility.Invisible, cursorVisibility);
            }
        }

        top.Dispose ();
        Application.Shutdown ();
    }

    [Fact]
    [AutoInitShutdown ()]
    public void HistoryText_Undo_Redo_Copy_Without_Selection_Multi_Line_Paste ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.CursorPosition = new (23, 0);

        Assert.True (tv.NewKeyDownEvent (Key.C.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ("This is the first line.", Clipboard.Contents);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (23, 0), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (23, 1), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (23, 0), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (23, 1), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Cut_Multi_Line_Another_Selected_Paste ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (17, 0);

        Assert.True (tv.NewKeyDownEvent (Key.W.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        tv.SelectionStartColumn = 12;
        tv.SelectionStartRow = 1;
        tv.CursorPosition = new (18, 1);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the first line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (17, 1), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 1), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the first line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (17, 1), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Cut_Multi_Line_Selected_Paste ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (17, 0);

        Assert.True (tv.NewKeyDownEvent (Key.W.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (11, 1);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));
        Assert.Equal ($"This is the first second line.{Environment.NewLine}This is the third line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (17, 0), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the  line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"This is the first second line.{Environment.NewLine}This is the third line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (17, 0), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Cut_Simple_Paste_Starting ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (18, 1);

        Assert.True (tv.NewKeyDownEvent (Key.W.WithCtrl));
        Assert.Equal ($"This is the  line.{Environment.NewLine}This is the third line.", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        tv.IsSelecting = false;

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (18, 1), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"This is the  line.{Environment.NewLine}This is the third line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (18, 1), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Empty_Copy_Without_Selection_Multi_Line_Selected_Paste ()
    {
        var text = "\nThis is the first line.\nThis is the second line.";
        var tv = new TextView { Text = text };

        Assert.True (tv.NewKeyDownEvent (Key.C.WithCtrl));

        Assert.Equal (
                      $"{Environment.NewLine}This is the first line.{Environment.NewLine}This is the second line.",
                      tv.Text
                     );
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"{Environment.NewLine}{Environment.NewLine}This is the first line.{Environment.NewLine}This is the second line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"{Environment.NewLine}This is the first line.{Environment.NewLine}This is the second line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"{Environment.NewLine}{Environment.NewLine}This is the first line.{Environment.NewLine}This is the second line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_KillToEndOfLine ()
    {
        var text = "First line.\nSecond line.";
        var tv = new TextView { Text = text };

        Assert.True (tv.NewKeyDownEvent (Key.K.WithCtrl));
        Assert.Equal ($"{Environment.NewLine}Second line.", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ("First line.", Clipboard.Contents);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.K.WithCtrl));
        Assert.Equal ("Second line.", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ($"First line.{Environment.NewLine}", Clipboard.Contents);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.K.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ($"First line.{Environment.NewLine}Second line.", Clipboard.Contents);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("Second line.", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"{Environment.NewLine}Second line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"First line.{Environment.NewLine}Second line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"{Environment.NewLine}Second line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("Second line.", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_KillToLeftStart ()
    {
        var text = "First line.\nSecond line.";
        var tv = new TextView { Text = text };

        Assert.True (tv.NewKeyDownEvent (Key.End.WithCtrl));
        Assert.Equal ($"First line.{Environment.NewLine}Second line.", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (12, 1), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Backspace.WithCtrl.WithShift));
        Assert.Equal ($"First line.{Environment.NewLine}", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ("Second line.", Clipboard.Contents);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Backspace.WithCtrl.WithShift));
        Assert.Equal ("First line.", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ($"Second line.{Environment.NewLine}", Clipboard.Contents);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (11, 0), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Backspace.WithCtrl.WithShift));
        Assert.Equal ("", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal ($"Second line.{Environment.NewLine}First line.", Clipboard.Contents);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("First line.", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (11, 0), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"First line.{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"First line.{Environment.NewLine}Second line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (12, 1), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"First line.{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("First line.", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (11, 0), tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_DeleteCharLeft ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var ntimes = 3;
        tv.CursorPosition = new (7, 1);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharLeft ();
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 1), tv.CursorPosition);

        tv.CursorPosition = new (7, 0);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharLeft ();
        }

        Assert.Equal (
                      $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 0), tv.CursorPosition);

        tv.CursorPosition = new (7, 2);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharLeft ();
        }

        Assert.Equal (
                      $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

            switch (i)
            {
                case 0:
                    Assert.Equal (
                                  $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This  the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (5, 2), tv.CursorPosition);

                    break;
                case 1:
                    Assert.Equal (
                                  $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This i the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (6, 2), tv.CursorPosition);

                    break;
                case 2:
                    Assert.Equal (
                                  $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (7, 2), tv.CursorPosition);

                    break;
            }
        }

        Assert.Equal (
                      $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 2), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

            switch (i)
            {
                case 0:
                    Assert.Equal (
                                  $"This  the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (5, 0), tv.CursorPosition);

                    break;
                case 1:
                    Assert.Equal (
                                  $"This i the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (6, 0), tv.CursorPosition);

                    break;
                case 2:
                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (7, 0), tv.CursorPosition);

                    break;
            }
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 0), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

            switch (i)
            {
                case 0:
                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This  the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (5, 1), tv.CursorPosition);

                    break;
                case 1:
                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This i the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (6, 1), tv.CursorPosition);

                    break;
                case 2:
                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (7, 1), tv.CursorPosition);

                    break;
            }
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 0), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_DeleteCharRight ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var ntimes = 3;
        tv.CursorPosition = new (7, 1);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharRight ();
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        tv.CursorPosition = new (7, 0);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharRight ();
        }

        Assert.Equal (
                      $"This ise first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 0), tv.CursorPosition);

        tv.CursorPosition = new (7, 2);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharRight ();
        }

        Assert.Equal (
                      $"This ise first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This ise third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 2), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This ise first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 2), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 0), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This ise first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 0), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This ise first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This ise third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 2), tv.CursorPosition);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_InsertText ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var messy = " messy";
        tv.CursorPosition = new (7, 1);
        tv.InsertText (messy);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 1), tv.CursorPosition);

        tv.CursorPosition = new (7, 0);
        tv.InsertText (messy);

        Assert.Equal (
                      $"This is messy the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 0), tv.CursorPosition);

        tv.CursorPosition = new (7, 2);
        tv.InsertText (messy);

        Assert.Equal (
                      $"This is messy the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is messy the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 2), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is messy the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 2), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 0), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 1), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is messy the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 0), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is messy the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is messy the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 2), tv.CursorPosition);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_Selected_Copy_Simple_Paste_Starting_On_Letter ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (18, 1);

        Assert.True (tv.NewKeyDownEvent (Key.C.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal ($"first line.{Environment.NewLine}This is the second", tv.SelectedText);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (18, 1), tv.CursorPosition);

        tv.IsSelecting = false;
        tv.CursorPosition = new (17, 1);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the seconfirst line.{Environment.NewLine}This is the secondd line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (18, 2), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (17, 1), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the seconfirst line.{Environment.NewLine}This is the secondd line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (18, 2), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_Selected_Copy_Simple_Paste_Starting_On_Space ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (18, 1);

        Assert.True (tv.NewKeyDownEvent (Key.C.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal ($"first line.{Environment.NewLine}This is the second", tv.SelectedText);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (18, 1), tv.CursorPosition);

        tv.IsSelecting = false;

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the secondfirst line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (18, 2), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (18, 1), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the secondfirst line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (18, 2), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_Selected_InsertText ()
    {
        var text =
            $"This is the first line.{Environment.NewLine}This is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var messy = " messy";
        tv.CursorPosition = new (7, 0);
        tv.SelectionStartColumn = 11;
        tv.SelectionStartRow = 2;
        Assert.Equal (51 + Environment.NewLine.Length * 2, tv.SelectedLength);

        for (var i = 0; i < messy.Length; i++)
        {
            tv.InsertText (messy [i].ToString ());

            switch (i)
            {
                case 0:
                    Assert.Equal ("This is  third line.", tv.Text);
                    Assert.Equal (new (8, 0), tv.CursorPosition);

                    break;
                case 1:
                    Assert.Equal ("This is m third line.", tv.Text);
                    Assert.Equal (new (9, 0), tv.CursorPosition);

                    break;
                case 2:
                    Assert.Equal ("This is me third line.", tv.Text);
                    Assert.Equal (new (10, 0), tv.CursorPosition);

                    break;
                case 3:
                    Assert.Equal ("This is mes third line.", tv.Text);
                    Assert.Equal (new (11, 0), tv.CursorPosition);

                    break;
                case 4:
                    Assert.Equal ("This is mess third line.", tv.Text);
                    Assert.Equal (new (12, 0), tv.CursorPosition);

                    break;
                case 5:
                    Assert.Equal ("This is messy third line.", tv.Text);
                    Assert.Equal (new (13, 0), tv.CursorPosition);

                    break;
            }
        }

        Assert.Equal ("This is messy third line.", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (13, 0), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (2, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

            switch (i)
            {
                case 0:
                    Assert.Equal ("This is mess third line.", tv.Text);
                    Assert.Equal (new (12, 0), tv.CursorPosition);

                    break;
                case 1:
                    Assert.Equal ("This is mes third line.", tv.Text);
                    Assert.Equal (new (11, 0), tv.CursorPosition);

                    break;
                case 2:
                    Assert.Equal ("This is me third line.", tv.Text);
                    Assert.Equal (new (10, 0), tv.CursorPosition);

                    break;
                case 3:
                    Assert.Equal ("This is m third line.", tv.Text);
                    Assert.Equal (new (9, 0), tv.CursorPosition);

                    break;
                case 4:
                    Assert.Equal ("This is  third line.", tv.Text);
                    Assert.Equal (new (8, 0), tv.CursorPosition);

                    break;
                case 5:
                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                                  tv.Text
                                 );
                    Assert.Equal (new (7, 0), tv.CursorPosition);

                    break;
            }
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 0), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (2, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

            switch (i)
            {
                case 0:
                    Assert.Equal ("This is  third line.", tv.Text);
                    Assert.Equal (new (8, 0), tv.CursorPosition);

                    break;
                case 1:
                    Assert.Equal ("This is m third line.", tv.Text);
                    Assert.Equal (new (9, 0), tv.CursorPosition);

                    break;
                case 2:
                    Assert.Equal ("This is me third line.", tv.Text);
                    Assert.Equal (new (10, 0), tv.CursorPosition);

                    break;
                case 3:
                    Assert.Equal ("This is mes third line.", tv.Text);
                    Assert.Equal (new (11, 0), tv.CursorPosition);

                    break;
                case 4:
                    Assert.Equal ("This is mess third line.", tv.Text);
                    Assert.Equal (new (12, 0), tv.CursorPosition);

                    break;
                case 5:
                    Assert.Equal ("This is messy third line.", tv.Text);
                    Assert.Equal (new (13, 0), tv.CursorPosition);

                    break;
            }
        }

        Assert.Equal ("This is messy third line.", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (13, 0), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (2, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_Selected_InsertText_Twice_On_Same_Line ()
    {
        var text = "One\nTwo\nThree";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.False (tv.IsDirty);

        tv.SelectionStartColumn = 0;
        tv.SelectionStartRow = 0;
        tv.CursorPosition = new (0, 1);
        Assert.Equal (3 + Environment.NewLine.Length, tv.SelectedLength);

        Assert.True (tv.NewKeyDownEvent (Key.D1));
        Assert.Equal ($"1Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        tv.SelectionStartColumn = 1;
        tv.SelectionStartRow = 0;
        tv.CursorPosition = new (1, 1);
        Assert.Equal (4 + Environment.NewLine.Length, tv.SelectedLength);

        Assert.True (tv.NewKeyDownEvent (Key.D2));
        Assert.Equal ("12hree", tv.Text);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"1Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.False (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"1Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("12hree", tv.Text);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_Selected_InsertText_Twice_On_Same_Line_With_End_Line ()
    {
        var text = "One\nTwo\nThree\n";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.False (tv.IsDirty);

        tv.SelectionStartColumn = 0;
        tv.SelectionStartRow = 0;
        tv.CursorPosition = new (0, 1);
        Assert.Equal (3 + Environment.NewLine.Length, tv.SelectedLength);

        Assert.True (tv.NewKeyDownEvent (Key.D1));
        Assert.Equal ($"1Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        tv.SelectionStartColumn = 1;
        tv.SelectionStartRow = 0;
        tv.CursorPosition = new (1, 1);
        Assert.Equal (4 + Environment.NewLine.Length, tv.SelectedLength);

        Assert.True (tv.NewKeyDownEvent (Key.D2));
        Assert.Equal ($"12hree{Environment.NewLine}", tv.Text);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"1Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.False (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"1Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"12hree{Environment.NewLine}", tv.Text);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_Selected_With_Empty_Text ()
    {
        var tv = new TextView { Width = 10, Height = 2 };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.False (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.O.WithShift));
        Assert.Equal ("O", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.N));
        Assert.Equal ("On", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.E));
        Assert.Equal ("One", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        Assert.Equal ($"One{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.T.WithShift));
        Assert.Equal ($"One{Environment.NewLine}T", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.W));
        Assert.Equal ($"One{Environment.NewLine}Tw", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.O));
        Assert.Equal ($"One{Environment.NewLine}Two", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (3, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.T.WithShift));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}T", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.H));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Th", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (2, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thr", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (3, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.E));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thre", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.E));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 3), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        tv.SelectionStartColumn = 0;
        tv.SelectionStartRow = 0;
        tv.CursorPosition = new (0, 1);
        Assert.Equal (3 + Environment.NewLine.Length, tv.SelectedLength);

        Assert.True (tv.NewKeyDownEvent (Key.D1));
        Assert.Equal ($"1Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        tv.SelectionStartColumn = 1;
        tv.SelectionStartRow = 0;
        tv.CursorPosition = new (1, 1);
        Assert.Equal (4 + Environment.NewLine.Length, tv.SelectedLength);

        Assert.True (tv.NewKeyDownEvent (Key.D2));
        Assert.Equal ($"12hree{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        // Undoing
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"1Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thre", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thr", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (3, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Th", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (2, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}T", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (3, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Tw", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}T", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("One", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("On", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("O", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.False (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.False (tv.IsDirty);

        // Redoing
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("O", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("On", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("One", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}T", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Tw", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (3, 1), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}T", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Th", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (2, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thr", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (3, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thre", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 3), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"1Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"12hree{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.Equal (0, tv.SelectedLength);
        Assert.True (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Multi_Line_With_Empty_Text ()
    {
        var tv = new TextView { Width = 10, Height = 2 };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.False (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.O.WithShift));
        Assert.Equal ("O", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.N));
        Assert.Equal ("On", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.E));
        Assert.Equal ("One", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        Assert.Equal ($"One{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.T.WithShift));
        Assert.Equal ($"One{Environment.NewLine}T", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.W));
        Assert.Equal ($"One{Environment.NewLine}Tw", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.O));
        Assert.Equal ($"One{Environment.NewLine}Two", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (3, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.T.WithShift));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}T", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.H));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Th", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (2, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thr", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (3, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.E));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thre", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.E));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Enter));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 3), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        // Undoing
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thre", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thr", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (3, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Th", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (2, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}T", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (3, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Tw", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}T", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("One", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("On", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("O", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.False (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.False (tv.IsDirty);

        // Redoing
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("O", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (1, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("On", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (2, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ("One", tv.Text);
        Assert.Equal (1, tv.Lines);
        Assert.Equal (new (3, 0), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (0, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}T", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (1, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Tw", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (2, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (3, 1), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (0, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}T", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (1, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Th", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (2, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thr", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (3, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Thre", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three", tv.Text);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 3), tv.CursorPosition);
        Assert.True (tv.IsDirty);

        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"One{Environment.NewLine}Two{Environment.NewLine}Three{Environment.NewLine}", tv.Text);
        Assert.Equal (4, tv.Lines);
        Assert.Equal (new (0, 3), tv.CursorPosition);
        Assert.True (tv.IsDirty);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Setting_Clipboard_Multi_Line_Selected_Paste ()
    {
        var text = "This is the first line.\nThis is the second line.";
        var tv = new TextView { Text = text };

        Clipboard.Contents = "Inserted\nNewLine";

        Assert.Equal ($"This is the first line.{Environment.NewLine}This is the second line.", tv.Text);
        Assert.Equal ("", tv.SelectedText);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));

        Assert.Equal (
                      $"Inserted{Environment.NewLine}NewLineThis is the first line.{Environment.NewLine}This is the second line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ($"This is the first line.{Environment.NewLine}This is the second line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));

        Assert.Equal (
                      $"Inserted{Environment.NewLine}NewLineThis is the first line.{Environment.NewLine}This is the second line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
    }

    [Fact]
    [AutoInitShutdown ()]
    public void HistoryText_Undo_Redo_Simple_Copy_Multi_Line_Selected_Paste ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Text = text };

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (17, 0);

        Assert.True (tv.NewKeyDownEvent (Key.C.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal ("first", tv.SelectedText);
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (17, 0), tv.CursorPosition);

        tv.SelectionStartColumn = 12;
        tv.CursorPosition = new (11, 1);

        Assert.True (tv.NewKeyDownEvent (Key.Y.WithCtrl));
        Assert.Equal ($"This is the first second line.{Environment.NewLine}This is the third line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (17, 0), tv.CursorPosition);

        // Undo
        Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (12, 0), tv.CursorPosition);

        // Redo
        Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        Assert.Equal ($"This is the first second line.{Environment.NewLine}This is the third line.", tv.Text);
        Assert.Equal (2, tv.Lines);
        Assert.Equal (new (17, 0), tv.CursorPosition);
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Single_Line_DeleteCharLeft ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var ntimes = 3;
        tv.CursorPosition = new (7, 1);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharLeft ();
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (4, 1), tv.CursorPosition);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Single_Line_DeleteCharRight ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var ntimes = 3;
        tv.CursorPosition = new (7, 1);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharRight ();
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This ise second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Single_Line_InsertText ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var messy = " messy";
        tv.CursorPosition = new (7, 1);
        tv.InsertText (messy);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 1), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 1), tv.CursorPosition);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Single_Line_Selected_DeleteCharLeft ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var ntimes = 3;
        tv.CursorPosition = new (7, 1);
        tv.SelectionStartColumn = 11;
        tv.SelectionStartRow = 1;
        Assert.Equal (4, tv.SelectedLength);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharLeft ();
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This  second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This  second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (5, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Single_Line_Selected_DeleteCharRight ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var ntimes = 3;
        tv.CursorPosition = new (7, 1);
        tv.SelectionStartColumn = 11;
        tv.SelectionStartRow = 1;
        Assert.Equal (4, tv.SelectedLength);

        for (var i = 0; i < ntimes; i++)
        {
            tv.DeleteCharRight ();
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This isecond line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < ntimes; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This isecond line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void HistoryText_Undo_Redo_Single_Line_Selected_InsertText ()
    {
        var text = "This is the first line.\nThis is the second line.\nThis is the third line.";
        var tv = new TextView { Width = 10, Height = 2, Text = text };
        Toplevel top = new ();
        top.Add (tv);
        Application.Begin (top);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        var messy = " messy";
        tv.CursorPosition = new (7, 1);
        tv.SelectionStartColumn = 11;
        tv.SelectionStartRow = 1;
        Assert.Equal (4, tv.SelectedLength);
        tv.InsertText (messy);

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.Z.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (7, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);

        for (var i = 0; i < messy.Length; i++)
        {
            Assert.True (tv.NewKeyDownEvent (Key.R.WithCtrl));
        }

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is messy second line.{Environment.NewLine}This is the third line.",
                      tv.Text
                     );
        Assert.Equal (3, tv.Lines);
        Assert.Equal (new (13, 1), tv.CursorPosition);
        Assert.Equal (11, tv.SelectionStartColumn);
        Assert.Equal (1, tv.SelectionStartRow);
        Assert.Equal (0, tv.SelectedLength);
        top.Dispose ();
    }
    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Kill_Delete_WordBackward ()
    {
        _textView.Text = "This is the first line.";
        _textView.MoveEnd ();
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            _textView.NewKeyDownEvent (Key.Backspace.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (22, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first line", _textView.Text);

                    break;
                case 1:
                    Assert.Equal (18, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first ", _textView.Text);

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the ", _textView.Text);

                    break;
                case 3:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is ", _textView.Text);

                    break;
                case 4:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This ", _textView.Text);

                    break;
                case 5:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("", _textView.Text);

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Kill_Delete_WordBackward_Multiline ()
    {
        _textView.Text = "This is the first line.\nThis is the second line.";
        _textView.Width = 4;
        _textView.MoveEnd ();
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            _textView.NewKeyDownEvent (Key.Backspace.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "This is the first line."
                                  + Environment.NewLine
                                  + "This is the second line",
                                  _textView.Text
                                 );

                    break;
                case 1:
                    Assert.Equal (19, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "This is the first line."
                                  + Environment.NewLine
                                  + "This is the second ",
                                  _textView.Text
                                 );

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "This is the first line."
                                  + Environment.NewLine
                                  + "This is the ",
                                  _textView.Text
                                 );

                    break;
                case 3:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "This is the first line."
                                  + Environment.NewLine
                                  + "This is ",
                                  _textView.Text
                                 );

                    break;
                case 4:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "This is the first line."
                                  + Environment.NewLine
                                  + "This ",
                                  _textView.Text
                                 );

                    break;
                case 5:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first line." + Environment.NewLine, _textView.Text);

                    break;
                case 6:
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first line.", _textView.Text);

                    break;
                case 7:
                    Assert.Equal (22, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first line", _textView.Text);

                    break;
                case 8:
                    Assert.Equal (18, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first ", _textView.Text);

                    break;
                case 9:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the ", _textView.Text);

                    break;
                case 10:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is ", _textView.Text);

                    break;
                case 11:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This ", _textView.Text);

                    break;
                case 12:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("", _textView.Text);

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Kill_Delete_WordForward ()
    {
        _textView.Text = "This is the first line.";
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            _textView.NewKeyDownEvent (Key.Delete.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("is the first line.", _textView.Text);

                    break;
                case 1:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("the first line.", _textView.Text);

                    break;
                case 2:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("first line.", _textView.Text);

                    break;
                case 3:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("line.", _textView.Text);

                    break;
                case 4:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (".", _textView.Text);

                    break;
                case 5:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("", _textView.Text);

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Kill_Delete_WordForward_Multiline ()
    {
        _textView.Text = "This is the first line.\nThis is the second line.";
        _textView.Width = 4;
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            _textView.NewKeyDownEvent (Key.Delete.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "is the first line."
                                  + Environment.NewLine
                                  + "This is the second line.",
                                  _textView.Text
                                 );

                    break;
                case 1:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "the first line."
                                  + Environment.NewLine
                                  + "This is the second line.",
                                  _textView.Text
                                 );

                    break;
                case 2:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "first line."
                                  + Environment.NewLine
                                  + "This is the second line.",
                                  _textView.Text
                                 );

                    break;
                case 3:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "line."
                                  + Environment.NewLine
                                  + "This is the second line.",
                                  _textView.Text
                                 );

                    break;
                case 4:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  "."
                                  + Environment.NewLine
                                  + "This is the second line.",
                                  _textView.Text
                                 );

                    break;
                case 5:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);

                    Assert.Equal (
                                  ""
                                  + Environment.NewLine
                                  + "This is the second line.",
                                  _textView.Text
                                 );

                    break;
                case 6:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the second line.", _textView.Text);

                    break;
                case 7:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("is the second line.", _textView.Text);

                    break;
                case 8:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("the second line.", _textView.Text);

                    break;
                case 9:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("second line.", _textView.Text);

                    break;
                case 10:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("line.", _textView.Text);

                    break;
                case 11:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (".", _textView.Text);

                    break;
                case 12:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("", _textView.Text);

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact (Skip = "Fake Clipboard is broken")]
    [TextViewTestsSetupFakeApplication]
    public void Kill_To_End_Delete_Forwards_Copy_To_The_Clipboard_And_Paste ()
    {
        _textView.Text = "This is the first line.\nThis is the second line.";
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            switch (iteration)
            {
                case 0:
                    _textView.NewKeyDownEvent (Key.K.WithCtrl);
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ($"{Environment.NewLine}This is the second line.", _textView.Text);
                    Assert.Equal ("This is the first line.", Clipboard.Contents);

                    break;
                case 1:
                    _textView.NewKeyDownEvent (
                                               new (
                                                    KeyCode.Delete | KeyCode.CtrlMask | KeyCode.ShiftMask
                                                   )
                                              );
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the second line.", _textView.Text);
                    Assert.Equal ($"This is the first line.{Environment.NewLine}", Clipboard.Contents);

                    break;
                case 2:
                    _textView.NewKeyDownEvent (Key.K.WithCtrl);
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("", _textView.Text);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line.",
                                  Clipboard.Contents
                                 );

                    // Paste
                    _textView.NewKeyDownEvent (Key.Y.WithCtrl);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line.",
                                  _textView.Text
                                 );

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact (Skip = "FakeClipboard is broken in some way, causing this unit test to fail intermittently.")]
    [TextViewTestsSetupFakeApplication]
    public void Kill_To_Start_Delete_Backwards_Copy_To_The_Clipboard_And_Paste ()
    {
        _textView.Text = "This is the first line.\nThis is the second line.";
        _textView.MoveEnd ();
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            switch (iteration)
            {
                case 0:
                    _textView.NewKeyDownEvent (Key.Backspace.WithCtrl.WithShift);
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal ($"This is the first line.{Environment.NewLine}", _textView.Text);
                    Assert.Equal ("This is the second line.", Clipboard.Contents);

                    break;
                case 1:
                    _textView.NewKeyDownEvent (
                                               new (
                                                    KeyCode.Backspace | KeyCode.CtrlMask | KeyCode.ShiftMask
                                                   )
                                              );
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("This is the first line.", _textView.Text);
                    Assert.Equal ($"This is the second line.{Environment.NewLine}", Clipboard.Contents);

                    break;
                case 2:
                    _textView.NewKeyDownEvent (Key.Backspace.WithCtrl.WithShift);
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal ("", _textView.Text);

                    Assert.Equal (
                                  $"This is the second line.{Environment.NewLine}This is the first line.",
                                  Clipboard.Contents
                                 );

                    // Paste inverted
                    _textView.NewKeyDownEvent (Key.Y.WithCtrl);

                    Assert.Equal (
                                  $"This is the second line.{Environment.NewLine}This is the first line.",
                                  _textView.Text
                                 );

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Mouse_Button_Shift_Preserves_Selection ()
    {
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);

        Assert.True (
                     _textView.NewMouseEvent (
                                              new () { Position = new (12, 0), Flags = MouseFlags.Button1Pressed | MouseFlags.ButtonShift }
                                             )
                    );
        Assert.Equal (0, _textView.SelectionStartColumn);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (12, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("TAB to jump ", _textView.SelectedText);

        Assert.True (_textView.NewMouseEvent (new () { Position = new (12, 0), Flags = MouseFlags.Button1Clicked }));
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (12, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("TAB to jump ", _textView.SelectedText);

        Assert.True (
                     _textView.NewMouseEvent (
                                              new () { Position = new (19, 0), Flags = MouseFlags.Button1Pressed | MouseFlags.ButtonShift }
                                             )
                    );
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (19, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("TAB to jump between", _textView.SelectedText);

        Assert.True (_textView.NewMouseEvent (new () { Position = new (19, 0), Flags = MouseFlags.Button1Clicked }));
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (19, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("TAB to jump between", _textView.SelectedText);

        Assert.True (
                     _textView.NewMouseEvent (
                                              new () { Position = new (24, 0), Flags = MouseFlags.Button1Pressed | MouseFlags.ButtonShift }
                                             )
                    );
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (24, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("TAB to jump between text", _textView.SelectedText);

        Assert.True (_textView.NewMouseEvent (new () { Position = new (24, 0), Flags = MouseFlags.Button1Clicked }));
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (24, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("TAB to jump between text", _textView.SelectedText);

        Assert.True (_textView.NewMouseEvent (new () { Position = new (24, 0), Flags = MouseFlags.Button1Pressed }));
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (new (24, 0), _textView.CursorPosition);
        Assert.True (_textView.IsSelecting);
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [SetupFakeApplication]
    public void MoveDown_By_Setting_CursorPosition ()
    {
        var tv = new TextView { Width = 10, Height = 5 };

        // add 100 lines of wide text to view
        for (var i = 0; i < 100; i++)
        {
            tv.Text += new string ('x', 100) + (i == 99 ? "" : Environment.NewLine);
        }

        Assert.Equal (Point.Empty, tv.CursorPosition);
        tv.CursorPosition = new (5, 50);
        Assert.Equal (new (5, 50), tv.CursorPosition);

        tv.CursorPosition = new (200, 200);
        Assert.Equal (new (100, 99), tv.CursorPosition);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Multiline_Setting_Changes_AllowsReturn_AllowsTab_Height_WordWrap ()
    {
        Assert.True (_textView.Multiline);
        Assert.True (_textView.AllowsReturn);
        Assert.Equal (4, _textView.TabWidth);
        Assert.True (_textView.AllowsTab);
        Assert.False (_textView.WordWrap);

        _textView.WordWrap = true;
        Assert.True (_textView.WordWrap);
        _textView.Multiline = false;
        Assert.False (_textView.Multiline);
        Assert.False (_textView.AllowsReturn);
        Assert.Equal (0, _textView.TabWidth);
        Assert.False (_textView.AllowsTab);
        Assert.False (_textView.WordWrap);

        _textView.WordWrap = true;
        Assert.False (_textView.WordWrap);
        _textView.Multiline = true;
        Assert.True (_textView.Multiline);
        Assert.True (_textView.AllowsReturn);
        Assert.Equal (4, _textView.TabWidth);
        Assert.True (_textView.AllowsTab);
        Assert.False (_textView.WordWrap);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Paste_Always_Clear_The_SelectedText ()
    {
        _textView.SelectionStartColumn = 20;
        _textView.SelectionStartRow = 0;
        _textView.CursorPosition = new (24, 0);
        _textView.NewKeyDownEvent (Key.C.WithCtrl); // Copy
        Assert.Equal ("text", _textView.SelectedText);
        _textView.NewKeyDownEvent (Key.Y.WithCtrl); // Paste
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [SetupFakeApplication]
    public void ScrollDownTillCaretOffscreen_ThenType ()
    {
        var tv = new TextView { Width = 10, Height = 5 };

        // add 100 lines of wide text to view
        for (var i = 0; i < 100; i++)
        {
            tv.Text += new string ('x', 100) + Environment.NewLine;
        }

        Assert.Equal (0, tv.CursorPosition.Y);
        tv.ScrollTo (50);
        Assert.Equal (0, tv.CursorPosition.Y);

        tv.NewKeyDownEvent (Key.P);
    }

    [Fact]
    [SetupFakeApplication]
    public void ScrollTo_CursorPosition ()
    {
        var tv = new TextView { Width = 10, Height = 5 };

        // add 100 lines of wide text to view
        for (var i = 0; i < 100; i++)
        {
            tv.Text += new string ('x', 100) + (i == 99 ? "" : Environment.NewLine);
        }

        Assert.Equal (Point.Empty, tv.CursorPosition);
        tv.ScrollTo (50);
        Assert.Equal (Point.Empty, tv.CursorPosition);

        tv.CursorPosition = new (tv.LeftColumn, tv.TopRow);
        Assert.Equal (new (0, 50), tv.CursorPosition);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Selected_Text_Shows ()
    {
        // Proves #3022 is fixed (TextField selected text does not show in v2)
        Toplevel top = new ();
        top.Add (_textView);
        SessionToken rs = Application.Begin (top);

        _textView.CursorPosition = Point.Empty;
        _textView.SelectionStartColumn = 0;
        _textView.SelectionStartRow = 0;

        Attribute [] attributes =
        {
            _textView.GetScheme ().Focus,
            new (_textView.GetScheme ().Focus.Background, _textView.GetScheme ().Focus.Foreground)
        };

        //                                             TAB to jump between text fields.
        DriverAssert.AssertDriverAttributesAre ("0000000", _output, Application.Driver, attributes);
        Assert.Empty (_textView.SelectedCellsList);

        _textView.NewKeyDownEvent (Key.CursorRight.WithCtrl.WithShift);

        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (new (4, 0), _textView.CursorPosition);

        //                                             TAB to jump between text fields.
        DriverAssert.AssertDriverAttributesAre ("1111000", _output, Application.Driver, attributes);
        Assert.Equal ("TAB ", Cell.ToString (_textView.SelectedCellsList [^1]));
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Selection_And_CursorPosition_With_Value_Greater_Than_Text_Length_Changes_Both_To_Text_Length ()
    {
        _textView.CursorPosition = new (33, 2);
        _textView.SelectionStartColumn = 33;
        _textView.SelectionStartRow = 33;
        Assert.Equal (32, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (32, _textView.SelectionStartColumn);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Selection_With_Empty_Text ()
    {
        _textView = new ();
        _textView.CursorPosition = new (2, 0);
        _textView.SelectionStartColumn = 33;
        _textView.SelectionStartRow = 1;
        Assert.Equal (0, _textView.SelectionStartColumn);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Selection_With_Value_Greater_Than_Text_Length_Changes_To_Text_Length ()
    {
        _textView.CursorPosition = new (2, 0);
        _textView.SelectionStartColumn = 33;
        _textView.SelectionStartRow = 1;
        Assert.Equal (32, _textView.SelectionStartColumn);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (30, _textView.SelectedLength);
        Assert.Equal ("B to jump between text fields.", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Selection_With_Value_Less_Than_Zero_Changes_To_Zero ()
    {
        _textView.SelectionStartColumn = -2;
        _textView.SelectionStartRow = -2;
        Assert.Equal (0, _textView.SelectionStartColumn);
        Assert.Equal (0, _textView.SelectionStartRow);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.Equal ("", _textView.SelectedText);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void TextChanged_Event ()
    {
        _textView.TextChanged += (s, e) =>
                                 {
                                     if (_textView.Text == "changing")
                                     {
                                         Assert.Equal ("changing", _textView.Text);
                                         _textView.Text = "changed";
                                     }
                                 };

        _textView.Text = "changing";
        Assert.Equal ("changed", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void TextChanged_Event_NoFires_OnTyping ()
    {
        var eventcount = 0;
        _textView.TextChanged += (s, e) => { eventcount++; };

        _textView.Text = "ay";
        Assert.Equal (1, eventcount);
        _textView.NewKeyDownEvent (Key.Y.WithShift);
        Assert.Equal (1, eventcount);
        Assert.Equal ("Yay", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void TextView_InsertText_Newline_CRLF ()
    {
        var tv = new TextView { Width = 10, Height = 10 };
        tv.InsertText ("\r\naaa\r\nbbb");
        PlatformID p = Environment.OSVersion.Platform;

        if (p == PlatformID.Win32NT || p == PlatformID.Win32S || p == PlatformID.Win32Windows)
        {
            Assert.Equal ("\r\naaa\r\nbbb", tv.Text);
        }
        else
        {
            Assert.Equal ("\naaa\nbbb", tv.Text);
        }

        Assert.Equal ($"{Environment.NewLine}aaa{Environment.NewLine}bbb", tv.Text);

        var win = new Window ();
        win.Add (tv);
        var top = new Toplevel ();
        top.Add (win);
        Application.Begin (top);
        Application.Driver!.SetScreenSize (15, 15);
        SetupFakeApplicationAttribute.RunIteration ();

        //this passes
        Rectangle pos = DriverAssert.AssertDriverContentsWithFrameAre (
                                                                       @"
┌─────────────┐
│             │
│aaa          │
│bbb          │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
└─────────────┘",
                                                                       _output
                                                                      );

        Assert.Equal (new (0, 0, 15, 15), pos);

        Assert.True (tv.Used);
        tv.Used = false;
        tv.CursorPosition = Point.Empty;
        tv.InsertText ("\r\naaa\r\nbbb");
        SetupFakeApplicationAttribute.RunIteration ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
┌─────────────┐
│             │
│aaa          │
│bbb          │
│aaa          │
│bbb          │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
└─────────────┘",
                                                       _output
                                                      );
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void TextView_InsertText_Newline_LF ()
    {
        var tv = new TextView { Width = 10, Height = 10 };
        tv.InsertText ("\naaa\nbbb");
        PlatformID p = Environment.OSVersion.Platform;

        if (p == PlatformID.Win32NT || p == PlatformID.Win32S || p == PlatformID.Win32Windows)
        {
            Assert.Equal ("\r\naaa\r\nbbb", tv.Text);
        }
        else
        {
            Assert.Equal ("\naaa\nbbb", tv.Text);
        }

        Assert.Equal ($"{Environment.NewLine}aaa{Environment.NewLine}bbb", tv.Text);

        var win = new Window ();
        win.Add (tv);
        var top = new Toplevel ();
        top.Add (win);
        Application.Begin (top);
        Application.Driver!.SetScreenSize (15, 15);
        SetupFakeApplicationAttribute.RunIteration ();

        //this passes
        Rectangle pos = DriverAssert.AssertDriverContentsWithFrameAre (
                                                                       @"
┌─────────────┐
│             │
│aaa          │
│bbb          │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
└─────────────┘",
                                                                       _output
                                                                      );

        Assert.Equal (new (0, 0, 15, 15), pos);

        Assert.True (tv.Used);
        tv.Used = false;
        tv.CursorPosition = Point.Empty;
        tv.InsertText ("\naaa\nbbb");
        SetupFakeApplicationAttribute.RunIteration ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
┌─────────────┐
│             │
│aaa          │
│bbb          │
│aaa          │
│bbb          │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
│             │
└─────────────┘",
                                                       _output
                                                      );
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void TextView_SpaceHandling ()
    {
        var tv = new TextView { Width = 10, Text = " " };

        var ev = new MouseEventArgs { Position = new (0, 0), Flags = MouseFlags.Button1DoubleClicked };

        tv.NewMouseEvent (ev);
        Assert.Equal (1, tv.SelectedLength);

        ev = new () { Position = new (1, 0), Flags = MouseFlags.Button1DoubleClicked };

        tv.NewMouseEvent (ev);
        Assert.Equal (1, tv.SelectedLength);
    }
    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Used_Is_False ()
    {
        _textView.Used = false;
        _textView.CursorPosition = new (10, 0);
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.U); // u
        Assert.Equal ("TAB to jumu between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.S); // s
        Assert.Equal ("TAB to jumusbetween text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.E); // e
        Assert.Equal ("TAB to jumuseetween text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.D); // d
        Assert.Equal ("TAB to jumusedtween text fields.", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void Used_Is_True_By_Default ()
    {
        _textView.CursorPosition = new (10, 0);
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.U); // u
        Assert.Equal ("TAB to jumup between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.S); // s
        Assert.Equal ("TAB to jumusp between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.E); // e
        Assert.Equal ("TAB to jumusep between text fields.", _textView.Text);
        _textView.NewKeyDownEvent (Key.D); // d
        Assert.Equal ("TAB to jumusedp between text fields.", _textView.Text);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordBackward_Multiline_With_Selection ()
    {
        //		          4         3          2         1
        //		  87654321098765432109876 54321098765432109876543210-Length
        //			    1         2              1         2
        //                01234567890123456789012  0123456789012345678901234
        _textView.Text = "This is the first line.\nThis is the second line.";

        _textView.MoveEnd ();
        _textView.SelectionStartColumn = _textView.CurrentColumn;
        _textView.SelectionStartRow = _textView.CurrentRow;
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            _textView.NewKeyDownEvent (Key.CursorLeft.WithCtrl.WithShift);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (1, _textView.SelectedLength);
                    Assert.Equal (".", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (19, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (5, _textView.SelectedLength);
                    Assert.Equal ("line.", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (12, _textView.SelectedLength);
                    Assert.Equal ("second line.", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (16, _textView.SelectedLength);
                    Assert.Equal ("the second line.", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (19, _textView.SelectedLength);
                    Assert.Equal ("is the second line.", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (24, _textView.SelectedLength);
                    Assert.Equal ("This is the second line.", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (24 + Environment.NewLine.Length, _textView.SelectedLength);
                    Assert.Equal ($"{Environment.NewLine}This is the second line.", _textView.SelectedText);

                    break;
                case 7:
                    Assert.Equal (22, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (25 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $".{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                case 8:
                    Assert.Equal (18, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (29 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"line.{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                case 9:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (35 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"first line.{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                case 10:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (39 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"the first line.{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                case 11:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (42 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"is the first line.{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                case 12:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (24, _textView.SelectionStartColumn);
                    Assert.Equal (1, _textView.SelectionStartRow);
                    Assert.Equal (47 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordBackward_With_No_Selection ()
    {
        _textView.CursorPosition = new (_textView.Text.Length, 0);
        var iteration = 0;

        while (_textView.CursorPosition.X > 0)
        {
            _textView.NewKeyDownEvent (Key.CursorLeft.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (31, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (20, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (7, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (4, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordBackward_With_No_Selection_And_With_More_Than_Only_One_Whitespace_And_With_Only_One_Letter ()
    {
        //                          1         2         3         4         5    
        //                0123456789012345678901234567890123456789012345678901234=55 (Length)
        _textView.Text = "TAB   t  o  jump         b  etween    t ext   f ields .";
        _textView.CursorPosition = new (_textView.Text.Length, 0);
        var iteration = 0;

        while (_textView.CursorPosition.X > 0)
        {
            _textView.NewKeyDownEvent (Key.CursorLeft.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (54, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (48, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (46, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (40, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (38, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (28, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 7:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 8:
                    Assert.Equal (9, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 9:
                    Assert.Equal (6, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 10:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordBackward_With_Selection ()
    {
        _textView.CursorPosition = new (_textView.Text.Length, 0);
        _textView.SelectionStartColumn = _textView.Text.Length;
        _textView.SelectionStartRow = 0;
        var iteration = 0;

        while (_textView.CursorPosition.X > 0)
        {
            _textView.NewKeyDownEvent (Key.CursorLeft.WithCtrl.WithShift);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (31, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (1, _textView.SelectedLength);
                    Assert.Equal (".", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (7, _textView.SelectedLength);
                    Assert.Equal ("fields.", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (20, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (12, _textView.SelectedLength);
                    Assert.Equal ("text fields.", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (20, _textView.SelectedLength);
                    Assert.Equal ("between text fields.", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (7, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (25, _textView.SelectedLength);
                    Assert.Equal ("jump between text fields.", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (4, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (28, _textView.SelectedLength);
                    Assert.Equal ("to jump between text fields.", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (32, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (32, _textView.SelectedLength);
                    Assert.Equal ("TAB to jump between text fields.", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void
        WordBackward_With_The_Same_Values_For_SelectedStart_And_CursorPosition_And_Not_Starting_At_Beginning_Of_The_Text ()
    {
        _textView.CursorPosition = new (10, 0);
        _textView.SelectionStartColumn = 10;
        _textView.SelectionStartRow = 0;
        var iteration = 0;

        while (_textView.CursorPosition.X > 0)
        {
            _textView.NewKeyDownEvent (Key.CursorLeft.WithCtrl.WithShift);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (7, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (3, _textView.SelectedLength);
                    Assert.Equal ("jum", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (4, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (6, _textView.SelectedLength);
                    Assert.Equal ("to jum", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (10, _textView.SelectedLength);
                    Assert.Equal ("TAB to jum", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordForward_Multiline_With_Selection ()
    {
        //			    1         2          3         4
        //		  01234567890123456789012 34567890123456789012345678-Length
        //			    1         2              1         2
        //                01234567890123456789012  0123456789012345678901234
        _textView.Text = "This is the first line.\nThis is the second line.";

        _textView.SelectionStartColumn = _textView.CurrentColumn;
        _textView.SelectionStartRow = _textView.CurrentRow;
        var iteration = 0;
        var iterationsFinished = false;

        while (!iterationsFinished)
        {
            _textView.NewKeyDownEvent (
                                       Key.CursorRight.WithCtrl.WithShift
                                      );

            switch (iteration)
            {
                case 0:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (5, _textView.SelectedLength);
                    Assert.Equal ("This ", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (8, _textView.SelectedLength);
                    Assert.Equal ("This is ", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (12, _textView.SelectedLength);
                    Assert.Equal ("This is the ", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (18, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (18, _textView.SelectedLength);
                    Assert.Equal ("This is the first ", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (22, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (22, _textView.SelectedLength);
                    Assert.Equal ("This is the first line", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (23, _textView.SelectedLength);
                    Assert.Equal ("This is the first line.", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (0, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (23 + Environment.NewLine.Length, _textView.SelectedLength);
                    Assert.Equal ($"This is the first line.{Environment.NewLine}", _textView.SelectedText);

                    break;
                case 7:
                    Assert.Equal (5, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (28 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This ",
                                  _textView.SelectedText
                                 );

                    break;
                case 8:
                    Assert.Equal (8, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (31 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is ",
                                  _textView.SelectedText
                                 );

                    break;
                case 9:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (35 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the ",
                                  _textView.SelectedText
                                 );

                    break;
                case 10:
                    Assert.Equal (19, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (42 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second ",
                                  _textView.SelectedText
                                 );

                    break;
                case 11:
                    Assert.Equal (23, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (46 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line",
                                  _textView.SelectedText
                                 );

                    break;
                case 12:
                    Assert.Equal (24, _textView.CursorPosition.X);
                    Assert.Equal (1, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (47 + Environment.NewLine.Length, _textView.SelectedLength);

                    Assert.Equal (
                                  $"This is the first line.{Environment.NewLine}This is the second line.",
                                  _textView.SelectedText
                                 );

                    break;
                default:
                    iterationsFinished = true;

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordForward_With_No_Selection ()
    {
        _textView.CursorPosition = Point.Empty;
        var iteration = 0;

        while (_textView.CursorPosition.X < _textView.Text.Length)
        {
            _textView.NewKeyDownEvent (Key.CursorRight.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (4, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (7, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (20, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (31, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (32, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordForward_With_No_Selection_And_With_More_Than_Only_One_Whitespace_And_With_Only_One_Letter ()
    {
        //                          1         2         3         4         5    
        //                0123456789012345678901234567890123456789012345678901234=55 (Length)
        _textView.Text = "TAB   t  o  jump         b  etween    t ext   f ields .";
        _textView.CursorPosition = Point.Empty;
        var iteration = 0;

        while (_textView.CursorPosition.X < _textView.Text.Length)
        {
            _textView.NewKeyDownEvent (Key.CursorRight.WithCtrl);

            switch (iteration)
            {
                case 0:
                    Assert.Equal (6, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (9, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (28, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (38, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (40, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 7:
                    Assert.Equal (46, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 8:
                    Assert.Equal (48, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 9:
                    Assert.Equal (54, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
                case 10:
                    Assert.Equal (55, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (0, _textView.SelectedLength);
                    Assert.Equal ("", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordForward_With_Selection ()
    {
        _textView.CursorPosition = Point.Empty;
        _textView.SelectionStartColumn = 0;
        _textView.SelectionStartRow = 0;
        var iteration = 0;

        while (_textView.CursorPosition.X < _textView.Text.Length)
        {
            _textView.NewKeyDownEvent (
                                       Key.CursorRight.WithCtrl.WithShift
                                      );

            switch (iteration)
            {
                case 0:
                    Assert.Equal (4, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (4, _textView.SelectedLength);
                    Assert.Equal ("TAB ", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (7, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (7, _textView.SelectedLength);
                    Assert.Equal ("TAB to ", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (12, _textView.SelectedLength);
                    Assert.Equal ("TAB to jump ", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (20, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (20, _textView.SelectedLength);
                    Assert.Equal ("TAB to jump between ", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (25, _textView.SelectedLength);
                    Assert.Equal ("TAB to jump between text ", _textView.SelectedText);

                    break;
                case 5:
                    Assert.Equal (31, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (31, _textView.SelectedLength);
                    Assert.Equal ("TAB to jump between text fields", _textView.SelectedText);

                    break;
                case 6:
                    Assert.Equal (32, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (0, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (32, _textView.SelectedLength);
                    Assert.Equal ("TAB to jump between text fields.", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void
        WordForward_With_The_Same_Values_For_SelectedStart_And_CursorPosition_And_Not_Starting_At_Beginning_Of_The_Text ()
    {
        _textView.CursorPosition = new (10, 0);
        _textView.SelectionStartColumn = 10;
        _textView.SelectionStartRow = 0;
        var iteration = 0;

        while (_textView.CursorPosition.X < _textView.Text.Length)
        {
            _textView.NewKeyDownEvent (
                                       Key.CursorRight.WithCtrl.WithShift
                                      );

            switch (iteration)
            {
                case 0:
                    Assert.Equal (12, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (2, _textView.SelectedLength);
                    Assert.Equal ("p ", _textView.SelectedText);

                    break;
                case 1:
                    Assert.Equal (20, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (10, _textView.SelectedLength);
                    Assert.Equal ("p between ", _textView.SelectedText);

                    break;
                case 2:
                    Assert.Equal (25, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (15, _textView.SelectedLength);
                    Assert.Equal ("p between text ", _textView.SelectedText);

                    break;
                case 3:
                    Assert.Equal (31, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (21, _textView.SelectedLength);
                    Assert.Equal ("p between text fields", _textView.SelectedText);

                    break;
                case 4:
                    Assert.Equal (32, _textView.CursorPosition.X);
                    Assert.Equal (0, _textView.CursorPosition.Y);
                    Assert.Equal (10, _textView.SelectionStartColumn);
                    Assert.Equal (0, _textView.SelectionStartRow);
                    Assert.Equal (22, _textView.SelectedLength);
                    Assert.Equal ("p between text fields.", _textView.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [SetupFakeApplication]
    public void WordWrap_Deleting_Backwards ()
    {
        var tv = new TextView { Width = 5, Height = 2, WordWrap = true, Text = "aaaa" };
        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.Equal (Point.Empty, tv.CursorPosition);
        Assert.Equal (0, tv.LeftColumn);

        DriverAssert.AssertDriverContentsAre (
                                              @"
aaaa
",
                                              _output
                                             );

        tv.CursorPosition = new (5, 0);
        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (0, tv.LeftColumn);

        DriverAssert.AssertDriverContentsAre (
                                              @"
aaa
",
                                              _output
                                             );

        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (0, tv.LeftColumn);

        DriverAssert.AssertDriverContentsAre (
                                              @"
aa
",
                                              _output
                                             );

        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (0, tv.LeftColumn);

        DriverAssert.AssertDriverContentsAre (
                                              @"
a
",
                                              _output
                                             );

        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (0, tv.LeftColumn);

        DriverAssert.AssertDriverContentsAre (
                                              @"

",
                                              _output
                                             );

        Assert.True (tv.NewKeyDownEvent (Key.Backspace));
        SetupFakeApplicationAttribute.RunIteration ();
        Assert.Equal (0, tv.LeftColumn);

        DriverAssert.AssertDriverContentsAre (
                                              @"

",
                                              _output
                                             );
        top.Dispose ();
    }

    [Theory]
    [TextViewTestsSetupFakeApplication]
    [InlineData (KeyCode.Delete)]
    public void WordWrap_Draw_Typed_Keys_After_Text_Is_Deleted (KeyCode del)
    {
        var top = new Toplevel ();
        top.Add (_textView);
        _textView.Text = "Line 1.\nLine 2.";
        _textView.WordWrap = true;
        Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.True (_textView.WordWrap);

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
Line 1.
Line 2.",
                                                       _output
                                                      );

        Assert.True (_textView.NewKeyDownEvent (Key.End.WithShift));
        Assert.Equal ("Line 1.", _textView.SelectedText);

        Assert.True (_textView.NewKeyDownEvent (new (del)));
        SetupFakeApplicationAttribute.RunIteration ();
        DriverAssert.AssertDriverContentsWithFrameAre ("Line 2.", _output);

        Assert.True (_textView.NewKeyDownEvent (Key.H.WithShift));
        Assert.NotEqual (Rectangle.Empty, _textView.NeedsDrawRect);
        SetupFakeApplicationAttribute.RunIteration ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
H      
Line 2.",
                                                       _output
                                                      );
        top.Dispose ();
    }

    [Fact]
    [SetupFakeApplication]
    public void WordWrap_Not_Throw_If_Width_Is_Less_Than_Zero ()
    {
        Exception exception = Record.Exception (
                                                () =>
                                                {
                                                    var tv = new TextView
                                                    {
                                                        Width = Dim.Fill (),
                                                        Height = Dim.Fill (),
                                                        WordWrap = true,
                                                        Text = "これは、左右のクリップ境界をテストするための非常に長いテキストです。"
                                                    };
                                                }
                                               );
        Assert.Null (exception);
    }

    [Fact]
    [SetupFakeApplication]
    public void WordWrap_ReadOnly_CursorPosition_SelectedText_Copy ()
    {
        //          0123456789
        var text = "This is the first line.\nThis is the second line.\n";
        var tv = new TextView { Width = 11, Height = 9 };
        tv.Text = text;

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}",
                      tv.Text
                     );
        tv.WordWrap = true;

        var top = new Toplevel ()
        {
            Driver = ApplicationImpl.Instance.Driver,
        };
        top.Add (tv);
        top.Layout ();
        tv.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is  
the first
line.    
This is  
the      
second   
line.    
",
                                                       _output
                                                      );

        tv.ReadOnly = true;
        tv.CursorPosition = new (6, 2);
        Assert.Equal (new (5, 2), tv.CursorPosition);
        top.LayoutSubViews ();
        top.SetClipToScreen ();
        tv.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is   
the first 
line.     
This is   
the second
line.     
",
                                                       _output
                                                      );

        tv.SelectionStartRow = 0;
        tv.SelectionStartColumn = 0;
        Assert.Equal ("This is the first line.", tv.SelectedText);

        tv.Copy ();
        Assert.Equal ("This is the first line.", Clipboard.Contents);
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordWrap_True_LoadStream_New_Text ()
    {
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        _textView.WordWrap = true;
        Assert.Equal ("TAB to jump between text fields.", _textView.Text);
        var text = "This is the first line.\nThis is the second line.\n";

        using (var stream = new MemoryStream ())
        {
            var writer = new StreamWriter (stream);
            writer.Write (text);
            writer.Flush ();
            stream.Position = 0;

            _textView.Load (stream);

            Assert.Equal (
                          $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}",
                          _textView.Text
                         );
            Assert.True (_textView.WordWrap);
        }
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void WordWrap_WrapModel_Output ()
    {
        //          0123456789
        var text = "This is the first line.\nThis is the second line.\n";
        var tv = new TextView { Width = 10, Height = 10 };
        tv.Text = text;

        Assert.Equal (
                      $"This is the first line.{Environment.NewLine}This is the second line.{Environment.NewLine}",
                      tv.Text
                     );
        tv.WordWrap = true;

        var top = new Toplevel ()
        {
            Driver = ApplicationImpl.Instance.Driver,
        };
        top.Add (tv);

        top.Layout ();
        tv.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is
the    
first  
line.  
This is
the    
second 
line.  
",
                                                       _output
                                                      );
    }

    private int GetLeftCol (int start)
    {
        string [] lines = _textView.Text.Split (Environment.NewLine);

        if (lines is { Length: 0 })
        {
            return 0;
        }

        if (start == _textView.LeftColumn)
        {
            return start;
        }

        if (_textView.LeftColumn == _textView.CurrentColumn)
        {
            return _textView.CurrentColumn;
        }

        int cCol = _textView.CurrentColumn;
        string line = lines [_textView.CurrentRow];
        int lCount = cCol > line.Length - 1 ? line.Length - 1 : cCol;
        int width = _textView.Frame.Width;
        int tabWidth = _textView.TabWidth;
        var sumLength = 0;
        var col = 0;

        for (int i = lCount; i >= 0; i--)
        {
            char r = line [i];
            sumLength += ((Rune)r).GetColumns ();

            if (r == '\t')
            {
                sumLength += tabWidth + 1;
            }

            if (sumLength > width)
            {
                if (col + width == cCol)
                {
                    col++;
                }

                break;
            }

            if ((cCol < line.Length && col > 0 && start < cCol && col == start) || cCol - col == width - 1)
            {
                break;
            }

            col = i;
        }

        return col;
    }

    // This class enables test functions annotated with the [InitShutdown] attribute
    // to have a function called before the test function is called and after.
    // 
    // This is necessary because a) Application is a singleton and Init/Shutdown must be called
    // as a pair, and b) all unit test functions should be atomic.
    [AttributeUsage (AttributeTargets.Class | AttributeTargets.Method)]
    public class TextViewTestsSetupFakeApplication : SetupFakeApplicationAttribute
    {
        public static string Txt = "TAB to jump between text fields.";

        public TextViewTestsSetupFakeApplication () : base () { }

        public override void After (MethodInfo methodUnderTest)
        {
            _textView = null;
            base.After (methodUnderTest);
        }

        public override void Before (MethodInfo methodUnderTest)
        {
            base.Before (methodUnderTest);

            //                   1         2         3 
            //         01234567890123456789012345678901=32 (Length)
            byte [] buff = Encoding.Unicode.GetBytes (Txt);
            byte [] ms = new MemoryStream (buff).ToArray ();
            _textView = new () { Width = 30, Height = 10, SchemeName = "Base" };
            _textView.Text = Encoding.Unicode.GetString (ms);
        }
    }

    [Fact]
    [SetupFakeApplication]
    public void Draw_Esc_Rune ()
    {
        var tv = new TextView
        {
            Driver = ApplicationImpl.Instance.Driver,
            Width = 5, Height = 1, Text = "\u001b"
        };
        tv.BeginInit ();
        tv.EndInit ();
        tv.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre ("\u241b", _output);

        tv.Dispose ();
    }

    [Fact (Skip = "v2 fake driver broke. TextView still works; disabling tests.")]
    [SetupFakeApplication]
    public void CellEventArgs_WordWrap_True ()
    {
        var eventCount = 0;

        List<List<Cell>> text =
        [
            Cell.ToCells (
                          "This is the first line.".ToStringList ()
                         ),

            Cell.ToCells (
                          "This is the second line.".ToStringList ()
                         )
        ];
        TextView tv = CreateTextView ();
        tv.DrawNormalColor += TextView_DrawColor;
        tv.DrawReadOnlyColor += TextView_DrawColor;
        tv.DrawSelectionColor += TextView_DrawColor;
        tv.DrawUsedColor += TextView_DrawColor;

        void TextView_DrawColor (object sender, CellEventArgs e)
        {
            Assert.Equal (e.Line [e.Col], text [e.UnwrappedPosition.Row] [e.UnwrappedPosition.Col]);
            eventCount++;
        }

        tv.Text = $"{Cell.ToString (text [0])}\n{Cell.ToString (text [1])}\n";
        Assert.False (tv.WordWrap);
        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is the first line. 
This is the second line.",
                                                       _output
                                                      );

        tv.Width = 10;
        tv.Height = 25;
        tv.WordWrap = true;
        SetupFakeApplicationAttribute.RunIteration ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                       @"
This is
the    
first  
line.  
This is
the    
second 
line.  ",
                                                       _output
                                                      );

        Assert.Equal (eventCount, (text [0].Count + text [1].Count) * 2);
        top.Dispose ();
    }

    // BUGBUG: This test depends on the order of the schemes in SchemeManager.Schemes.
    // BUGBUG: Breaks on Mac/Linux?
    [Fact (Skip = "This test depends on the order of the schemes in SchemeManager.Schemes.")]
    [SetupFakeApplication]
    public void Cell_LoadCells_InheritsPreviousAttribute ()
    {
        List<Cell> cells = [];

        foreach (KeyValuePair<string, Scheme> color in SchemeManager.GetSchemes ())
        {
            string csName = color.Key;

            cells.AddRange (Cell.ToCellList (csName, color.Value.Normal));

            cells.Add (new () { Grapheme = "\n", Attribute = color.Value.Focus });
        }

        TextView tv = CreateTextView ();
        tv.Load (cells);
        var top = new Toplevel ();
        top.Add (tv);
        SessionToken rs = Application.Begin (top);
        SetupFakeApplicationAttribute.RunIteration ();

        Assert.True (tv.InheritsPreviousAttribute);

        var expectedText = @"
TopLevel
Base    
Dialog  
Menu    
Error   ";
        DriverAssert.AssertDriverContentsWithFrameAre (expectedText, _output);

        Attribute [] attributes =
        {
            // 0
            SchemeManager.GetSchemes () ["TopLevel"].Normal,

            // 1
            SchemeManager.GetSchemes () ["Base"].Normal,

            // 2
            SchemeManager.GetSchemes () ["Dialog"].Normal,

            // 3
            SchemeManager.GetSchemes () ["Menu"].Normal,

            // 4
            SchemeManager.GetSchemes () ["Error"].Normal,

            // 5
            tv.GetScheme ()!.Focus
        };

        var expectedColor = @"
0000000055
1111555555
2222225555
3333555555
4444455555";
        DriverAssert.AssertDriverAttributesAre (expectedColor, _output, Application.Driver, attributes);

        tv.WordWrap = true;
        SetupFakeApplicationAttribute.RunIteration ();
        DriverAssert.AssertDriverContentsWithFrameAre (expectedText, _output);
        DriverAssert.AssertDriverAttributesAre (expectedColor, _output, Application.Driver, attributes);

        tv.CursorPosition = new (6, 2);
        tv.SelectionStartColumn = 0;
        tv.SelectionStartRow = 0;
        Assert.Equal ($"TopLevel{Environment.NewLine}Base{Environment.NewLine}Dialog", tv.SelectedText);
        tv.Copy ();
        tv.IsSelecting = false;
        tv.CursorPosition = new (2, 4);
        tv.Paste ();
        SetupFakeApplicationAttribute.RunIteration ();

        expectedText = @"
TopLevel  
Base      
Dialog    
Menu      
ErTopLevel
Base      
Dialogror ";
        DriverAssert.AssertDriverContentsWithFrameAre (expectedText, _output);

        expectedColor = @"
0000000055
1111555555
2222225555
3333555555
4400000000
1111555555
2222224445";
        DriverAssert.AssertDriverAttributesAre (expectedColor, _output, Application.Driver, attributes);

        tv.Undo ();
        tv.CursorPosition = new (0, 3);
        tv.SelectionStartColumn = 0;
        tv.SelectionStartRow = 0;

        Assert.Equal (
                      $"TopLevel{Environment.NewLine}Base{Environment.NewLine}Dialog{Environment.NewLine}",
                      tv.SelectedText
                     );
        tv.Copy ();
        tv.IsSelecting = false;
        tv.CursorPosition = new (2, 4);
        tv.Paste ();
        SetupFakeApplicationAttribute.RunIteration ();

        expectedText = @"
TopLevel  
Base      
Dialog    
Menu      
ErTopLevel
Base      
Dialog    
ror       ";
        DriverAssert.AssertDriverContentsWithFrameAre (expectedText, _output);

        expectedColor = @"
0000000055
1111555555
2222225555
3333555555
4400000000
1111555555
2222225555
4445555555";
        DriverAssert.AssertDriverAttributesAre (expectedColor, _output, Application.Driver, attributes);

        Application.End (rs);
        top.Dispose ();
    }

    [Fact]
    [TextViewTestsSetupFakeApplication]
    public void IsSelecting_False_If_SelectedLength_Is_Zero_On_Mouse_Click ()
    {
        _textView.Text = "This is the first line.";
        var top = new Toplevel ();
        top.Add (_textView);
        Application.Begin (top);

        Application.RaiseMouseEvent (new () { ScreenPosition = new (22, 0), Flags = MouseFlags.Button1Pressed });
        Assert.Equal (22, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.True (_textView.IsSelecting);

        Application.RaiseMouseEvent (new () { ScreenPosition = new (22, 0), Flags = MouseFlags.Button1Released });
        Assert.Equal (22, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.True (_textView.IsSelecting);

        Application.RaiseMouseEvent (new () { ScreenPosition = new (22, 0), Flags = MouseFlags.Button1Clicked });
        Assert.Equal (22, _textView.CursorPosition.X);
        Assert.Equal (0, _textView.CursorPosition.Y);
        Assert.Equal (0, _textView.SelectedLength);
        Assert.False (_textView.IsSelecting);

        top.Dispose ();
        Application.Shutdown ();
    }

    private TextView CreateTextView () { return new () { Width = 30, Height = 10 }; }
}