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

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

namespace UnitTests.ViewsTests;

public class TextFieldTests (ITestOutputHelper output)
{
    private static TextField _textField;

    [Fact]
    [SetupFakeDriver]
    public void Accented_Letter_With_Three_Combining_Unicode_Chars ()
    {
        var tf = new TextField { Width = 3, Text = "ắ" };
        tf.Layout ();
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
ắ",
                                                      output
                                                     );

        tf.Text = "\u1eaf";
        tf.Layout ();
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
ắ",
                                                      output
                                                     );

        tf.Text = "\u0103\u0301";
        tf.Layout ();
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
ắ",
                                                      output
                                                     );

        tf.Text = "\u0061\u0306\u0301";
        tf.Layout ();
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
ắ",
                                                      output
                                                     );
    }

    [Fact]
    [SetupFakeDriver]
    public void Adjust_First ()
    {
        var tf = new TextField { Width = Dim.Fill (), Text = "This is a test." };
        tf.SetRelativeLayout (new (20, 20));
        tf.Draw ();

        Assert.Equal ("This is a test. ", GetContents ());

        string GetContents ()
        {
            var item = "";

            for (var i = 0; i < 16; i++)
            {
                item += Application.Driver?.Contents [0, i].Rune;
            }

            return item;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void CanFocus_False_Wont_Focus_With_Mouse ()
    {
        Toplevel top = new ();
        var tf = new TextField { 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 (tf);
        top.Add (fv);

        Application.Begin (top);

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

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

        Assert.Null (tf.SelectedText);
        Assert.False (tf.CanFocus);
        Assert.False (tf.HasFocus);
        Assert.False (fv.CanFocus);
        Assert.False (fv.HasFocus);

        fv.CanFocus = true;
        tf.CanFocus = true;

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

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

        fv.CanFocus = false;

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

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

    [Theory]
    [AutoInitShutdown]
    [InlineData ("0123456789", "0123456789")]
    [InlineData ("01234567890", "0123456789")]
    public void CaptionedTextField_DoesNotOverspillBounds (string caption, string expectedRender)
    {
        TextField tf = GetTextFieldsInView ();

        // Caption has no effect when focused
        tf.Title = caption;
        Application.RaiseKeyDownEvent ('\t');
        Assert.False (tf.HasFocus);

        tf.Draw ();
        DriverAssert.AssertDriverContentsAre (expectedRender, output);
        Application.Top.Dispose ();
    }

    [Fact]
    [AutoInitShutdown]
    public void CaptionedTextField_DoesNotOverspillViewport_Unicode ()
    {
        string caption = "Mise" + char.ConvertFromUtf32 (int.Parse ("0301", NumberStyles.HexNumber)) + "rables";

        Assert.Equal (11, caption.Length);
        Assert.Equal (10, caption.EnumerateRunes ().Sum (c => c.GetColumns ()));

        TextField tf = GetTextFieldsInView ();

        tf.Title = caption;
        Application.RaiseKeyDownEvent ('\t');
        Assert.False (tf.HasFocus);

        tf.Draw ();
        DriverAssert.AssertDriverContentsAre ("Misérables", output);
        Application.Top.Dispose ();
    }

    [Theory (Skip = "Broke with ContextMenuv2")]
    [AutoInitShutdown]
    [InlineData ("blah")]
    [InlineData (" ")]
    public void CaptionedTextField_DoNotRenderCaption_WhenTextPresent (string content)
    {
        TextField tf = GetTextFieldsInView ();

        tf.Draw ();
        DriverAssert.AssertDriverContentsAre ("", output);

        tf.Title = "Enter txt";
        Application.RaiseKeyDownEvent ('\t');

        // Caption should appear when not focused and no text
        Assert.False (tf.HasFocus);
        View.SetClipToScreen ();
        tf.Draw ();
        DriverAssert.AssertDriverContentsAre ("Enter txt", output);

        // but disapear when text is added
        tf.Text = content;
        View.SetClipToScreen ();
        tf.Draw ();
        DriverAssert.AssertDriverContentsAre (content, output);
        Application.Top.Dispose ();
    }

    [Fact]
    [AutoInitShutdown]
    public void CaptionedTextField_RendersCaption_WhenNotFocused ()
    {
        TextField tf = GetTextFieldsInView ();

        tf.Draw ();
        DriverAssert.AssertDriverContentsAre ("", output);

        // Caption has no effect when focused
        tf.Title = "Enter txt";
        Assert.True (tf.HasFocus);
        View.SetClipToScreen ();
        tf.Draw ();
        DriverAssert.AssertDriverContentsAre ("", output);

        Application.RaiseKeyDownEvent ('\t');

        Assert.False (tf.HasFocus);
        View.SetClipToScreen ();
        tf.Draw ();
        DriverAssert.AssertDriverContentsAre ("Enter txt", output);
        Application.Top.Dispose ();
    }

    [Fact]
    [AutoInitShutdown]
    public void Title_RendersAsCaption_WithCorrectAttributes ()
    {
        TextField tf = GetTextFieldsInView ();

        // Set a title (caption)
        tf.Title = "Enter text";
        
        // Remove focus so caption appears
        Application.RaiseKeyDownEvent ('\t');
        Assert.False (tf.HasFocus);

        View.SetClipToScreen ();
        tf.Draw ();
        
        // Verify the caption text is rendered
        DriverAssert.AssertDriverContentsAre ("Enter text", output);

        // Verify the caption uses dimmed color attribute
        Attribute captionAttr = new Attribute (
            tf.GetAttributeForRole (VisualRole.Editable).Foreground.GetDimColor (),
            tf.GetAttributeForRole (VisualRole.Editable).Background);

        // All characters in "Enter text" should have the caption attribute
        DriverAssert.AssertDriverAttributesAre ("0000000000", output, Application.Driver, captionAttr);

        Application.Top.Dispose ();
    }

    [Fact]
    [AutoInitShutdown]
    public void Title_WithHotkey_RendersUnderlined ()
    {
        TextField tf = GetTextFieldsInView ();

        // Title with hotkey should be rendered with the hotkey underlined when not focused
        tf.Title = "_Find";
        
        // Remove focus so caption appears
        Application.RaiseKeyDownEvent ('\t');
        Assert.False (tf.HasFocus);

        View.SetClipToScreen ();
        tf.Draw ();
        
        // The hotkey character 'F' should be rendered (without the underscore in the actual text)
        DriverAssert.AssertDriverContentsAre ("Find", output);

        // Verify the hotkey character 'F' has underline style
        Attribute captionAttr = new Attribute (
            tf.GetAttributeForRole (VisualRole.Editable).Foreground.GetDimColor (),
            tf.GetAttributeForRole (VisualRole.Editable).Background);
        Attribute hotkeyAttr = new Attribute (
            tf.GetAttributeForRole (VisualRole.Editable).Foreground.GetDimColor (),
            tf.GetAttributeForRole (VisualRole.Editable).Background,
            tf.GetAttributeForRole (VisualRole.Editable).Style | TextStyle.Underline);

        // F is underlined (index 1), remaining characters use normal caption attribute (index 0)
        DriverAssert.AssertDriverAttributesAre ("1000", output, Application.Driver, captionAttr, hotkeyAttr);

        Application.Top.Dispose ();
    }

    [Fact]
    [AutoInitShutdown]
    public void Title_WithHotkey_MiddleCharacter_RendersUnderlined ()
    {
        TextField tf = GetTextFieldsInView ();

        // Title with hotkey in middle of text
        tf.Title = "Enter _Text";
        
        // Remove focus so caption appears
        Application.RaiseKeyDownEvent ('\t');
        Assert.False (tf.HasFocus);

        View.SetClipToScreen ();
        tf.Draw ();
        
        // The underscore should not be rendered, 'T' should be underlined
        DriverAssert.AssertDriverContentsAre ("Enter Text", output);

        // Verify the hotkey character 'T' has underline style
        Attribute captionAttr = new Attribute (
            tf.GetAttributeForRole (VisualRole.Editable).Foreground.GetDimColor (),
            tf.GetAttributeForRole (VisualRole.Editable).Background);
        Attribute hotkeyAttr = new Attribute (
            tf.GetAttributeForRole (VisualRole.Editable).Foreground.GetDimColor (),
            tf.GetAttributeForRole (VisualRole.Editable).Background,
            tf.GetAttributeForRole (VisualRole.Editable).Style | TextStyle.Underline);

        // "Enter " (6 chars) + "T" (underlined) + "ext" (3 chars)
        DriverAssert.AssertDriverAttributesAre ("0000001000", output, Application.Driver, captionAttr, hotkeyAttr);

        Application.Top.Dispose ();
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Changing_SelectedStart_Or_CursorPosition_Update_SelectedLength_And_SelectedText ()
    {
        _textField.BeginInit ();
        _textField.EndInit ();
        _textField.SelectedStart = 2;
        Assert.Equal (32, _textField.CursorPosition);
        Assert.Equal (30, _textField.SelectedLength);
        Assert.Equal ("B to jump between text fields.", _textField.SelectedText);
        _textField.CursorPosition = 20;
        Assert.Equal (2, _textField.SelectedStart);
        Assert.Equal (18, _textField.SelectedLength);
        Assert.Equal ("B to jump between ", _textField.SelectedText);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Copy_Or_Cut__Not_Allowed_If_Secret_Is_True ()
    {
        _textField.Secret = true;
        _textField.SelectedStart = 20;
        _textField.CursorPosition = 24;
        _textField.Copy ();
        Assert.Null (_textField.SelectedText);
        _textField.Cut ();
        Assert.Null (_textField.SelectedText);
        _textField.Secret = false;
        _textField.Copy ();
        Assert.Equal ("text", _textField.SelectedText);
        _textField.Cut ();
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Copy_Or_Cut_And_Paste_With_No_Selection ()
    {
        _textField.SelectedStart = 20;
        _textField.CursorPosition = 24;
        _textField.Copy ();
        Assert.Equal ("text", _textField.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.SelectedStart = -1;
        _textField.Paste ();
        Assert.Equal ("TAB to jump between texttext fields.", _textField.Text);
        _textField.SelectedStart = 24;
        _textField.Cut ();
        Assert.Null (_textField.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.SelectedStart = -1;
        _textField.Paste ();
        Assert.Equal ("TAB to jump between texttext fields.", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Copy_Or_Cut_And_Paste_With_Selection ()
    {
        _textField.SelectedStart = 20;
        _textField.CursorPosition = 24;
        _textField.Copy ();
        Assert.Equal ("text", _textField.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.Paste ();
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.SelectedStart = 20;
        _textField.Cut ();
        _textField.Paste ();
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Copy_Or_Cut_Not_Null_If_Has_Selection ()
    {
        _textField.SelectedStart = 20;
        _textField.CursorPosition = 24;
        _textField.Copy ();
        Assert.Equal ("text", _textField.SelectedText);
        _textField.Cut ();
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Copy_Or_Cut_Null_If_No_Selection ()
    {
        _textField.SelectedStart = -1;
        _textField.Copy ();
        Assert.Null (_textField.SelectedText);
        _textField.Cut ();
        Assert.Null (_textField.SelectedText);
    }

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

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

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Copy_Paste_Text_Changing_Updates_Cursor_Position ()
    {
        _textField.BeginInit ();
        _textField.EndInit ();

        _textField.TextChanging += TextFieldTextChanging;

        void TextFieldTextChanging (object sender, ResultEventArgs<string> e)
        {
            if (e.Result.GetRuneCount () > 11)
            {
                e.Result = e.Result [..11];
            }
        }

        Assert.Equal (32, _textField.CursorPosition);
        _textField.SelectAll ();
        _textField.Cut ();
        Assert.Equal ("TAB to jump between text fields.", Application.Driver?.Clipboard!.GetClipboardData ());
        Assert.Equal (string.Empty, _textField.Text);
        Assert.Equal (0, _textField.CursorPosition);
        _textField.Paste ();
        Assert.Equal ("TAB to jump", _textField.Text);
        Assert.Equal (11, _textField.CursorPosition);

        _textField.TextChanging -= TextFieldTextChanging;
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Cursor_Position_Initialization ()
    {
        Assert.False (_textField.IsInitialized);

        // BUGBUG: IsInitialized is false and
        // CursorPosition wasn't calculated yet
        Assert.Equal (0, _textField.CursorPosition);
        _textField.BeginInit ();
        _textField.EndInit ();
        Assert.Equal (32, _textField.CursorPosition);
        Assert.Equal (0, _textField.SelectedLength);
        Assert.Null (_textField.SelectedText);
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void CursorPosition_With_Value_Greater_Than_Text_Length_Changes_To_Text_Length ()
    {
        _textField.CursorPosition = 33;
        Assert.Equal (32, _textField.CursorPosition);
        Assert.Equal (0, _textField.SelectedLength);
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void CursorPosition_With_Value_Less_Than_Zero_Changes_To_Zero ()
    {
        _textField.CursorPosition = -1;
        Assert.Equal (0, _textField.CursorPosition);
        Assert.Equal (0, _textField.SelectedLength);
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [AutoInitShutdown]
    public void DeleteSelectedText_InsertText_DeleteCharLeft_DeleteCharRight_Cut ()
    {
        var newText = "";
        var oldText = "";
        var tf = new TextField { Width = 10, Text = "-1" };

        tf.TextChanging += (s, e) =>
                           {
                               newText = e.Result;
                               oldText = tf.Text;
                           };

        var top = new Toplevel ();
        top.Add (tf);
        Application.Begin (top);

        Assert.Equal ("-1", tf.Text);

        // InsertText
        tf.SelectedStart = 1;
        tf.CursorPosition = 2;
        Assert.Equal (1, tf.SelectedLength);
        Assert.Equal ("1", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.D2));
        Assert.Equal ("-2", newText);
        Assert.Equal ("-1", oldText);
        Assert.Equal ("-2", tf.Text);

        // DeleteCharLeft
        tf.SelectedStart = 1;
        tf.CursorPosition = 2;
        Assert.Equal (1, tf.SelectedLength);
        Assert.Equal ("2", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.Backspace));
        Assert.Equal ("-", newText);
        Assert.Equal ("-2", oldText);
        Assert.Equal ("-", tf.Text);

        // DeleteCharRight
        tf.Text = "-1";
        tf.SelectedStart = 1;
        tf.CursorPosition = 2;
        Assert.Equal (1, tf.SelectedLength);
        Assert.Equal ("1", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.Delete));
        Assert.Equal ("-", newText);
        Assert.Equal ("-1", oldText);
        Assert.Equal ("-", tf.Text);

        // Cut
        tf.Text = "-1";
        tf.SelectedStart = 1;
        tf.CursorPosition = 2;
        Assert.Equal (1, tf.SelectedLength);
        Assert.Equal ("1", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.X.WithCtrl));
        Assert.Equal ("-", newText);
        Assert.Equal ("-1", oldText);
        Assert.Equal ("-", tf.Text);

        // Delete word with accented char
        tf.Text = "Les Misérables movie.";

        Assert.True (
                     tf.NewMouseEvent (
                                       new () { Position = new (7, 1), Flags = MouseFlags.Button1DoubleClicked, View = tf }
                                      )
                    );
        Assert.Equal ("Misérables ", tf.SelectedText);
        Assert.Equal (11, tf.SelectedLength);
        Assert.True (tf.NewKeyDownEvent (Key.Delete));
        Assert.Equal ("Les movie.", newText);
        Assert.Equal ("Les Misérables movie.", oldText);
        Assert.Equal ("Les movie.", tf.Text);
        top.Dispose ();
    }

    [Fact]
    [AutoInitShutdown (useFakeClipboard: true)]
    public void KeyBindings_Command ()
    {
        var tf = new TextField { Width = 20, Text = "This is a test." };
        tf.BeginInit ();
        tf.EndInit ();

        Assert.Equal (15, tf.Text.Length);
        Assert.Equal (15, tf.CursorPosition);
        Assert.False (tf.ReadOnly);

        Assert.True (tf.NewKeyDownEvent (Key.Delete));
        Assert.Equal ("This is a test.", tf.Text);
        tf.CursorPosition = 0;
        Assert.True (tf.NewKeyDownEvent (Key.Delete));
        Assert.Equal ("his is a test.", tf.Text);
        tf.ReadOnly = true;
        Assert.True (tf.NewKeyDownEvent (Key.D.WithCtrl));
        Assert.Equal ("his is a test.", tf.Text);
        Assert.True (tf.NewKeyDownEvent (Key.Delete));
        Assert.Equal ("his is a test.", tf.Text);
        tf.ReadOnly = false;
        tf.CursorPosition = 1;
        Assert.True (tf.NewKeyDownEvent (Key.Backspace));
        Assert.Equal ("is is a test.", tf.Text);
        tf.CursorPosition = 5;
        Assert.True (tf.NewKeyDownEvent (Key.Home.WithShift));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is is", tf.SelectedText);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.Home.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is is", tf.SelectedText);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.A.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is is", tf.SelectedText);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.End.WithShift));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (" a test.", tf.SelectedText);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.End.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (" a test.", tf.SelectedText);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.E.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (" a test.", tf.SelectedText);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.Home));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (0, tf.CursorPosition);
        tf.CursorPosition = 5;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.Home.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (0, tf.CursorPosition);
        tf.CursorPosition = 5;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.A.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (tf.Text.Length, tf.CursorPosition);
        tf.CursorPosition = 5;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorLeft.WithShift));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("s", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorUp.WithShift));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight.WithShift));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("s", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorDown.WithShift));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Null (tf.SelectedText);
        tf.CursorPosition = 7;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorLeft.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("a", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorUp.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is a", tf.SelectedText);
#if UNIX_KEY_BINDINGS
        Assert.True (tf.NewKeyDownEvent (Key.B.WithShift.WithAlt));
#else
        Assert.True (tf.NewKeyDownEvent (Key.CursorUp.WithShift.WithCtrl));
#endif
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is is a", tf.SelectedText);
        tf.CursorPosition = 3;
        tf.SelectedStart = -1;
        Assert.Null (tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is ", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorDown.WithShift.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is a ", tf.SelectedText);
#if UNIX_KEY_BINDINGS
        Assert.True (tf.NewKeyDownEvent (Key.F.WithShift.WithAlt));
#else
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight.WithShift.WithCtrl));
#endif
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal ("is a test", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight.WithShift.WithCtrl));
        Assert.Equal ("is a test.", tf.SelectedText);
        Assert.Equal (13, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.CursorLeft));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Null (tf.SelectedText);
        Assert.Equal (12, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.CursorLeft));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (11, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.End));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (13, tf.CursorPosition);
        tf.CursorPosition = 0;
        Assert.True (tf.NewKeyDownEvent (Key.End.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (13, tf.CursorPosition);
        tf.CursorPosition = 0;
        Assert.True (tf.NewKeyDownEvent (Key.E.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (13, tf.CursorPosition);
        tf.CursorPosition = 0;
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (1, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.F.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.Equal (2, tf.CursorPosition);
        tf.CursorPosition = 9;
        tf.ReadOnly = true;
        Assert.True (tf.NewKeyDownEvent (Key.K.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        tf.ReadOnly = false;
        Assert.True (tf.NewKeyDownEvent (Key.K.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal ("est.", Clipboard.Contents);
        Assert.True (tf.NewKeyDownEvent (Key.Z.WithCtrl));
        Assert.Equal ("is is a test.", tf.Text);
        Assert.True (tf.NewKeyDownEvent (Key.Y.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
#if UNIX_KEY_BINDINGS
        Assert.True (tf.NewKeyDownEvent (Key.Backspace.WithAlt));
#else
        Assert.True (tf.NewKeyDownEvent (Key.Z.WithCtrl));
#endif
        Assert.Equal ("is is a test.", tf.Text);
        Assert.True (tf.NewKeyDownEvent (Key.Y.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.True (tf.NewKeyDownEvent (Key.CursorLeft.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (8, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.CursorUp.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (6, tf.CursorPosition);
#if UNIX_KEY_BINDINGS
        Assert.True (tf.NewKeyDownEvent (Key.B.WithAlt));
#else
        Assert.True (tf.NewKeyDownEvent (Key.CursorLeft.WithCtrl));
#endif
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (3, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (6, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.CursorDown.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (8, tf.CursorPosition);
#if UNIX_KEY_BINDINGS
        Assert.True (tf.NewKeyDownEvent (Key.F.WithAlt));
#else
        Assert.True (tf.NewKeyDownEvent (Key.CursorRight.WithCtrl));
#endif
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (9, tf.CursorPosition);
        Assert.True (tf.Used);
        Assert.True (tf.NewKeyDownEvent (Key.InsertChar));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal (9, tf.CursorPosition);
        Assert.False (tf.Used);
        tf.SelectedStart = 3;
        tf.CursorPosition = 7;
        Assert.Equal ("is a", tf.SelectedText);
        Assert.Equal ("est.", Clipboard.Contents);
        Assert.True (tf.NewKeyDownEvent (Key.C.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal ("is a", Clipboard.Contents);
        Assert.True (tf.NewKeyDownEvent (Key.X.WithCtrl));
        Assert.Equal ("is  t", tf.Text);
        Assert.Equal ("is a", Clipboard.Contents);
        Assert.True (tf.NewKeyDownEvent (Key.V.WithCtrl));
        Assert.Equal ("is is a t", tf.Text);
        Assert.Equal ("is a", Clipboard.Contents);
        Assert.Equal (7, tf.CursorPosition);
#if UNIX_KEY_BINDINGS
        Assert.True (tf.NewKeyDownEvent (Key.K.WithAlt));
#else
        Assert.True (tf.NewKeyDownEvent (Key.K.WithCtrl.WithShift));
#endif
        Assert.Equal (" t", tf.Text);
        Assert.Equal ("is is a", Clipboard.Contents);
        tf.Text = "TAB to jump between text fields.";
        Assert.Equal (0, tf.CursorPosition);
        Assert.True (tf.NewKeyDownEvent (Key.Delete.WithCtrl));
        Assert.Equal ("to jump between text fields.", tf.Text);
        tf.CursorPosition = tf.Text.Length;
        Assert.True (tf.NewKeyDownEvent (Key.Backspace.WithCtrl));
        Assert.Equal ("to jump between text fields", tf.Text);
        Assert.True (tf.NewKeyDownEvent (Key.A.WithCtrl));
        Assert.Equal ("to jump between text fields", tf.SelectedText);
        Assert.True (tf.NewKeyDownEvent (Key.D.WithCtrl.WithShift));
        Assert.Equal ("", tf.Text);
    }

    [Theory]
    [InlineData (false, 1)]
    [InlineData (true, 0)]
    public void Accepted_Handler_Handled_Prevents_Default_Button_Accept (bool handleAccept, int expectedButtonAccepts)
    {
        var superView = new Window
        {
            Id = "superView"
        };

        var tf = new TextField
        {
            Id = "tf"
        };

        var button = new Button
        {
            Id = "button",
            IsDefault = true
        };

        superView.Add (tf, button);

        var buttonAccept = 0;
        button.Accepting += ButtonAccept;

        var textFieldAccept = 0;
        tf.Accepting += TextFieldAccept;

        tf.SetFocus ();
        Assert.True (tf.HasFocus);

        superView.NewKeyDownEvent (Key.Enter);
        Assert.Equal (1, textFieldAccept);
        Assert.Equal (expectedButtonAccepts, buttonAccept);

        button.SetFocus ();
        superView.NewKeyDownEvent (Key.Enter);
        Assert.Equal (1, textFieldAccept);
        Assert.Equal (expectedButtonAccepts + 1, buttonAccept);

        return;

        void TextFieldAccept (object sender, CommandEventArgs e)
        {
            textFieldAccept++;
            e.Handled = handleAccept;
        }

        void ButtonAccept (object sender, CommandEventArgs e) { buttonAccept++; }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Paste_Always_Clear_The_SelectedText ()
    {
        _textField.SelectedStart = 20;
        _textField.CursorPosition = 24;
        _textField.Copy ();
        Assert.Equal ("text", _textField.SelectedText);
        _textField.Paste ();
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [AutoInitShutdown]
    public void ScrollOffset_Initialize ()
    {
        var tf = new TextField { X = 1, Y = 1, Width = 20, Text = "Testing Scrolls." };
        tf.BeginInit ();
        tf.EndInit ();

        Assert.Equal (0, tf.ScrollOffset);
        Assert.Equal (16, tf.CursorPosition);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Selected_Text_Shows ()
    {
        // Proves #3022 is fixed (TextField selected text does not show in v2)

        _textField.CursorPosition = 0;
        var top = new Toplevel ();
        top.Add (_textField);
        RunState rs = Application.Begin (top);

        Attribute [] attributes =
        {
            _textField.GetAttributeForRole (VisualRole.Focus),
            new (
                 _textField.GetAttributeForRole (VisualRole.Focus).Background,
                 _textField.GetAttributeForRole (VisualRole.Focus).Foreground
                )
        };

        //                                             TAB to jump between text fields.
        DriverAssert.AssertDriverAttributesAre ("0000000", output, Application.Driver, attributes);

        // Cursor is at the end
        Assert.Equal (32, _textField.CursorPosition);
        _textField.CursorPosition = 0;
        _textField.NewKeyDownEvent (Key.CursorRight.WithCtrl.WithShift);

        AutoInitShutdownAttribute.RunIteration ();
        Assert.Equal (4, _textField.CursorPosition);

        //                                             TAB to jump between text fields.
        DriverAssert.AssertDriverAttributesAre ("1111000", output, Application.Driver, attributes);
        top.Dispose ();
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void SelectedStart_And_CursorPosition_With_Value_Greater_Than_Text_Length_Changes_Both_To_Text_Length ()
    {
        _textField.CursorPosition = 33;
        _textField.SelectedStart = 33;
        Assert.Equal (32, _textField.CursorPosition);
        Assert.Equal (32, _textField.SelectedStart);
        Assert.Equal (0, _textField.SelectedLength);
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void SelectedStart_Greater_Than_CursorPosition_All_Selection_Is_Overwritten_On_Typing ()
    {
        _textField.SelectedStart = 19;
        _textField.CursorPosition = 12;
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.NewKeyDownEvent (Key.U); // u
        Assert.Equal ("TAB to jump u text fields.", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void SelectedStart_With_Value_Greater_Than_Text_Length_Changes_To_Text_Length ()
    {
        _textField.CursorPosition = 2;
        _textField.SelectedStart = 33;
        Assert.Equal (32, _textField.SelectedStart);
        Assert.Equal (30, _textField.SelectedLength);
        Assert.Equal ("B to jump between text fields.", _textField.SelectedText);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void SelectedStart_With_Value_Less_Than_Minus_One_Changes_To_Minus_One ()
    {
        _textField.SelectedStart = -2;
        Assert.Equal (-1, _textField.SelectedStart);
        Assert.Equal (0, _textField.SelectedLength);
        Assert.Null (_textField.SelectedText);
    }

    [Fact]
    [AutoInitShutdown]
    public void MouseEvent_Handled_Prevents_RightClick ()
    {
        Application.MouseEvent += HandleRightClick;

        var tf = new TextField { Width = 10 };
        var clickCounter = 0;
        tf.MouseClick += (s, m) => { clickCounter++; };

        var top = new Toplevel ();
        top.Add (tf);
        Application.Begin (top);

        var mouseEvent = new MouseEventArgs { Flags = MouseFlags.Button1Clicked, View = tf };

        Application.RaiseMouseEvent (mouseEvent);
        Assert.Equal (1, clickCounter);

        // Get a fresh instance that represents a right click.
        // Should be ignored because of SuppressRightClick callback
        mouseEvent = new () { Flags = MouseFlags.Button3Clicked, View = tf };
        Application.RaiseMouseEvent (mouseEvent);
        Assert.Equal (1, clickCounter);

        Application.MouseEvent -= HandleRightClick;

        // Get a fresh instance that represents a right click.
        // Should no longer be ignored as the callback was removed
        mouseEvent = new () { Flags = MouseFlags.Button3Clicked, View = tf };

        // In #3183 OnMouseClicked is no longer called before MouseEvent().
        // This call causes the context menu to pop, and MouseEvent() returns true.
        // Thus, the clickCounter is NOT incremented.
        // Which is correct, because the user did NOT click with the left mouse button.
        Application.RaiseMouseEvent (mouseEvent);
        Assert.Equal (1, clickCounter);
        top.Dispose ();

        return;

        void HandleRightClick (object sender, MouseEventArgs arg)
        {
            if (arg.Flags.HasFlag (MouseFlags.Button3Clicked))
            {
                arg.Handled = true;
            }
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Text_Replaces_Tabs_With_Empty_String ()
    {
        _textField.Text = "\t\tTAB to jump between text fields.";
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.Text = "";
        Clipboard.Contents = "\t\tTAB to jump between text fields.";
        _textField.Paste ();
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void TextChanged_Event ()
    {
        var eventFired = false;
        _textField.TextChanged += (s, e) => eventFired = true;

        _textField.Text = "changed";
        Assert.True (eventFired);
        Assert.Equal ("changed", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void TextChanging_Event ()
    {
        var cancel = true;

        _textField.TextChanging += (s, e) =>
                                   {
                                       Assert.Equal ("changing", e.Result);

                                       if (cancel)
                                       {
                                           e.Handled = true;
                                       }
                                   };

        _textField.Text = "changing";
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        cancel = false;
        _textField.Text = "changing";
        Assert.Equal ("changing", _textField.Text);
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void Used_Is_False ()
    {
        _textField.Used = false;
        _textField.CursorPosition = 10;
        Assert.Equal ("TAB to jump between text fields.", _textField.Text);
        _textField.NewKeyDownEvent (Key.U); // u
        Assert.Equal ("TAB to jumu between text fields.", _textField.Text);
        _textField.NewKeyDownEvent (Key.S); // s
        Assert.Equal ("TAB to jumusbetween text fields.", _textField.Text);
        _textField.NewKeyDownEvent (Key.E); // e
        Assert.Equal ("TAB to jumuseetween text fields.", _textField.Text);
        _textField.NewKeyDownEvent (Key.D); // d
        Assert.Equal ("TAB to jumusedtween text fields.", _textField.Text);
    }

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

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void WordBackward_With_No_Selection ()
    {
        _textField.CursorPosition = _textField.Text.Length;
        var iteration = 0;

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

            switch (iteration)
            {
                case 0:
                    Assert.Equal (31, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (20, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (7, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 5:
                    Assert.Equal (4, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 6:
                    Assert.Equal (0, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    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)
        _textField.Text = "TAB   t  o  jump         b  etween    t ext   f ields .";
        _textField.CursorPosition = _textField.Text.Length;
        var iteration = 0;

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

            switch (iteration)
            {
                case 0:
                    Assert.Equal (54, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (48, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (46, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (40, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (38, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 5:
                    Assert.Equal (28, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 6:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 7:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 8:
                    Assert.Equal (9, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 9:
                    Assert.Equal (6, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 10:
                    Assert.Equal (0, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void WordBackward_With_Selection ()
    {
        _textField.CursorPosition = _textField.Text.Length;
        _textField.SelectedStart = _textField.Text.Length;
        var iteration = 0;

        while (_textField.CursorPosition > 0)
        {
            _textField.NewKeyDownEvent (
                                        new (
                                             KeyCode.CursorLeft | KeyCode.CtrlMask | KeyCode.ShiftMask
                                            )
                                       );

            switch (iteration)
            {
                case 0:
                    Assert.Equal (31, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (1, _textField.SelectedLength);
                    Assert.Equal (".", _textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (7, _textField.SelectedLength);
                    Assert.Equal ("fields.", _textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (20, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (12, _textField.SelectedLength);
                    Assert.Equal ("text fields.", _textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (20, _textField.SelectedLength);
                    Assert.Equal ("between text fields.", _textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (7, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (25, _textField.SelectedLength);
                    Assert.Equal ("jump between text fields.", _textField.SelectedText);

                    break;
                case 5:
                    Assert.Equal (4, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (28, _textField.SelectedLength);
                    Assert.Equal ("to jump between text fields.", _textField.SelectedText);

                    break;
                case 6:
                    Assert.Equal (0, _textField.CursorPosition);
                    Assert.Equal (32, _textField.SelectedStart);
                    Assert.Equal (32, _textField.SelectedLength);
                    Assert.Equal ("TAB to jump between text fields.", _textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void
        WordBackward_With_The_Same_Values_For_SelectedStart_And_CursorPosition_And_Not_Starting_At_Beginning_Of_The_Text ()
    {
        _textField.CursorPosition = 10;
        _textField.SelectedStart = 10;
        var iteration = 0;

        while (_textField.CursorPosition > 0)
        {
            _textField.NewKeyDownEvent (
                                        new (
                                             KeyCode.CursorLeft | KeyCode.CtrlMask | KeyCode.ShiftMask
                                            )
                                       );

            switch (iteration)
            {
                case 0:
                    Assert.Equal (7, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (3, _textField.SelectedLength);
                    Assert.Equal ("jum", _textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (4, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (6, _textField.SelectedLength);
                    Assert.Equal ("to jum", _textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (0, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (10, _textField.SelectedLength);
                    Assert.Equal ("TAB to jum", _textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void WordForward_With_No_Selection ()
    {
        _textField.CursorPosition = 0;
        var iteration = 0;

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

            switch (iteration)
            {
                case 0:
                    Assert.Equal (4, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (7, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (20, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 5:
                    Assert.Equal (31, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 6:
                    Assert.Equal (32, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    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)
        _textField.Text = "TAB   t  o  jump         b  etween    t ext   f ields .";
        _textField.CursorPosition = 0;
        var iteration = 0;

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

            switch (iteration)
            {
                case 0:
                    Assert.Equal (6, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (9, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (28, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 5:
                    Assert.Equal (38, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 6:
                    Assert.Equal (40, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 7:
                    Assert.Equal (46, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 8:
                    Assert.Equal (48, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 9:
                    Assert.Equal (54, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
                case 10:
                    Assert.Equal (55, _textField.CursorPosition);
                    Assert.Equal (-1, _textField.SelectedStart);
                    Assert.Equal (0, _textField.SelectedLength);
                    Assert.Null (_textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void WordForward_With_Selection ()
    {
        _textField.CursorPosition = 0;
        _textField.SelectedStart = 0;
        var iteration = 0;

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

            switch (iteration)
            {
                case 0:
                    Assert.Equal (4, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (4, _textField.SelectedLength);
                    Assert.Equal ("TAB ", _textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (7, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (7, _textField.SelectedLength);
                    Assert.Equal ("TAB to ", _textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (12, _textField.SelectedLength);
                    Assert.Equal ("TAB to jump ", _textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (20, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (20, _textField.SelectedLength);
                    Assert.Equal ("TAB to jump between ", _textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (25, _textField.SelectedLength);
                    Assert.Equal ("TAB to jump between text ", _textField.SelectedText);

                    break;
                case 5:
                    Assert.Equal (31, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (31, _textField.SelectedLength);
                    Assert.Equal ("TAB to jump between text fields", _textField.SelectedText);

                    break;
                case 6:
                    Assert.Equal (32, _textField.CursorPosition);
                    Assert.Equal (0, _textField.SelectedStart);
                    Assert.Equal (32, _textField.SelectedLength);
                    Assert.Equal ("TAB to jump between text fields.", _textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [TextFieldTestsAutoInitShutdown]
    public void
        WordForward_With_The_Same_Values_For_SelectedStart_And_CursorPosition_And_Not_Starting_At_Beginning_Of_The_Text ()
    {
        _textField.CursorPosition = 10;
        _textField.SelectedStart = 10;
        var iteration = 0;

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

            switch (iteration)
            {
                case 0:
                    Assert.Equal (12, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (2, _textField.SelectedLength);
                    Assert.Equal ("p ", _textField.SelectedText);

                    break;
                case 1:
                    Assert.Equal (20, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (10, _textField.SelectedLength);
                    Assert.Equal ("p between ", _textField.SelectedText);

                    break;
                case 2:
                    Assert.Equal (25, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (15, _textField.SelectedLength);
                    Assert.Equal ("p between text ", _textField.SelectedText);

                    break;
                case 3:
                    Assert.Equal (31, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (21, _textField.SelectedLength);
                    Assert.Equal ("p between text fields", _textField.SelectedText);

                    break;
                case 4:
                    Assert.Equal (32, _textField.CursorPosition);
                    Assert.Equal (10, _textField.SelectedStart);
                    Assert.Equal (22, _textField.SelectedLength);
                    Assert.Equal ("p between text fields.", _textField.SelectedText);

                    break;
            }

            iteration++;
        }
    }

    [Fact]
    [SetupFakeDriver]
    public void Words_With_Accents_Incorrect_Order_Will_Result_With_Wrong_Accent_Place ()
    {
        var tf = new TextField { Width = 30, Text = "Les Misérables" };
        tf.SetRelativeLayout (new (100, 100));
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
Les Misérables",
                                                      output
                                                     );

        tf.Text = "Les Mise" + char.ConvertFromUtf32 (int.Parse ("0301", NumberStyles.HexNumber)) + "rables";
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
Les Misérables",
                                                      output
                                                     );

        // incorrect order will result with a wrong accent place
        tf.Text = "Les Mis" + char.ConvertFromUtf32 (int.Parse ("0301", NumberStyles.HexNumber)) + "erables";
        View.SetClipToScreen ();
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre (
                                                      @"
Les Miśerables",
                                                      output
                                                     );
    }

    private TextField GetTextFieldsInView ()
    {
        var tf = new TextField { Width = 10 };
        var tf2 = new TextField { Y = 1, Width = 10 };

        Toplevel top = new ();
        top.Add (tf);
        top.Add (tf2);

        Application.Begin (top);

        Assert.Same (tf, top.Focused);

        return tf;
    }

    // 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 TextFieldTestsAutoInitShutdown : AutoInitShutdownAttribute
    {
        public override void After (MethodInfo methodUnderTest)
        {
            _textField.Dispose ();
            _textField = null;
            base.After (methodUnderTest);
        }

        public override void Before (MethodInfo methodUnderTest)
        {
            base.Before (methodUnderTest);

            //Application.Top.Scheme = Colors.Schemes ["Base"];
            _textField = new ()
            {
                //                1         2         3 
                //      01234567890123456789012345678901=32 (Length)
                Text = "TAB to jump between text fields.",
                Width = 32
            };
        }
    }

    [Fact]
    [AutoInitShutdown]
    public void Draw_Esc_Rune ()
    {
        var tf = new TextField { Width = 5, Text = "\u001b" };
        tf.BeginInit ();
        tf.EndInit ();
        tf.Draw ();

        DriverAssert.AssertDriverContentsWithFrameAre ("\u241b", output);

        tf.Dispose ();
    }
}