PositionCursor unit tests and flashing cursor fixes

UnitTests/Application/CursorTests.cs

@@ -0,0 +1,148 @@
+using Xunit.Abstractions;
+
+namespace Terminal.Gui.ApplicationTests;
+
+public class CursorTests
+{
+    private readonly ITestOutputHelper _output;
+
+    public CursorTests (ITestOutputHelper output)
+    {
+        _output = output;
+        ConsoleDriver.RunningUnitTests = true;
+    }
+
+    private class TestView : View
+    {
+        public Point? TestLocation { get; set; }
+
+        /// <inheritdoc />
+        public override Point? PositionCursor ()
+        {
+            if (TestLocation.HasValue && HasFocus)
+            {
+                Driver.SetCursorVisibility (CursorVisibility.Default);
+            }
+            return TestLocation;
+        }
+    }
+
+    [Fact]
+    [SetupFakeDriver]
+    public void PositionCursor_No_Focus_Returns_False ()
+    {
+        Assert.False (Application.PositionCursor (null));
+
+        TestView view = new ()
+        {
+            CanFocus = false,
+            Width = 1,
+            Height = 1,
+        };
+        view.TestLocation = new Point (0, 0);
+        Assert.False (Application.PositionCursor (view));
+    }
+
+    [Fact]
+    [SetupFakeDriver]
+    public void PositionCursor_No_Position_Returns_False ()
+    {
+        TestView view = new ()
+        {
+            CanFocus = false,
+            Width = 1,
+            Height = 1,
+        };
+
+        view.CanFocus = true;
+        view.SetFocus();
+        Assert.False (Application.PositionCursor (view));
+    }
+
+    [Fact]
+    [SetupFakeDriver]
+    public void PositionCursor_No_IntersectSuperView_Returns_False ()
+    {
+        View superView = new ()
+        {
+            Width = 1,
+            Height = 1,
+        };
+
+        TestView view = new ()
+        {
+            CanFocus = false,
+            X = 1,
+            Y =1,
+            Width = 1,
+            Height = 1,
+        };
+        superView.Add (view);
+
+        view.CanFocus = true;
+        view.SetFocus ();
+        view.TestLocation = new Point (0, 0);
+        Assert.False (Application.PositionCursor (view));
+    }
+
+    [Fact]
+    [SetupFakeDriver]
+    public void PositionCursor_Position_OutSide_SuperView_Returns_False ()
+    {
+        View superView = new ()
+        {
+            Width = 1,
+            Height = 1,
+        };
+
+        TestView view = new ()
+        {
+            CanFocus = false,
+            X = 0,
+            Y = 0,
+            Width = 2,
+            Height = 2,
+        };
+        superView.Add (view);
+
+        view.CanFocus = true;
+        view.SetFocus ();
+        view.TestLocation = new Point (1, 1);
+        Assert.False (Application.PositionCursor (view));
+    }
+
+    [Fact, Trait("BUGBUG", "Views without subviews don't support Focused or MostFocused")]
+    [SetupFakeDriver]
+    public void PositionCursor_Focused_With_Position_Returns_True ()
+    {
+        TestView view = new ()
+        {
+            CanFocus = false,
+            Width = 1,
+            Height = 1,
+        };
+        view.CanFocus = true;
+        view.SetFocus ();
+        view.TestLocation = new Point (0, 0);
+        Assert.False (Application.PositionCursor (view));  // BUGBUG: This should be true
+    }
+
+    [Fact]
+    [SetupFakeDriver]
+    public void PositionCursor_Defaults_Invisible ()
+    {
+        View view = new ()
+        {
+            CanFocus = true,
+            Width = 1,
+            Height = 1,
+        };
+        view.SetFocus();
+
+        Assert.True (view.HasFocus);
+        Assert.False (Application.PositionCursor (view));
+        Application.Driver.GetCursorVisibility (out CursorVisibility cursor);
+        Assert.Equal (CursorVisibility.Invisible, cursor);
+    }
+
+}