PixiEditor/PixiEditorTests/ModelsTests/ToolsTests/PenToolTests.cs

using PixiEditor.Models.Position;
using PixiEditor.Models.Tools.Tools;
using PixiEditorTests.HelpersTests;
using SkiaSharp;
using Xunit;

namespace PixiEditorTests.ModelsTests.ToolsTests
{
    [Collection("Application collection")]
    public class PenToolTests
    {
        [StaFact]
        public void TestThatPixelPerfectPenReturnsShapeWithoutLShapePixels()
        {
            PenTool pen = ViewModelHelper.BuildMockedTool<PenTool>();

            Coordinates start = new Coordinates(0, 0);
            Coordinates end = new Coordinates(0, 0);
            Coordinates end2 = new Coordinates(1, 0);
            Coordinates start2 = new Coordinates(1, 1);

            pen.Draw(start, end, SKColors.Black, 1, true);
            pen.Draw(end, end2, SKColors.Black, 1, true);
            var points = pen.Draw(end2, start2, SKColors.Black, 1, true);

            Assert.Contains(points.ChangedPixels, x => x.Value.Alpha == 0);
        }
    }
}