unit test for invalidate on immediate renderer when renderedtransfom is used, issue #1998

tests/Avalonia.Visuals.UnitTests/Rendering/ImmediateRendererTests.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Avalonia.Media;
+using Avalonia.Rendering;
+using Avalonia.VisualTree;
+using Moq;
+using Xunit;
+
+namespace Avalonia.Visuals.UnitTests.Rendering
+{
+    public class ImmediateRendererTests
+    {
+        [Fact]
+        public void AddDirty_Call_RenderRoot_Invalidate()
+        {
+            var visual = new Mock<Visual>();
+            var child = new Mock<Visual>();
+            var renderRoot = visual.As<IRenderRoot>();
+
+            visual.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(0, 0, 400, 400));
+
+            child.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(10, 10, 100, 100));
+            child.As<IVisual>().Setup(v => v.VisualParent).Returns(visual.Object);
+            child.As<IVisual>().Setup(v => v.RenderTransform).Returns(default(Transform));
+            child.As<IVisual>().Setup(v => v.RenderTransformOrigin).Returns(new RelativePoint(0.5, 0.5, RelativeUnit.Relative));
+            child.As<IVisual>().Setup(v => v.TransformToVisual(It.IsAny<IVisual>())).CallBase();
+
+            var target = new ImmediateRenderer(visual.Object);
+
+            target.AddDirty(child.Object);
+
+            renderRoot.Verify(v => v.Invalidate(new Rect(10, 10, 100, 100)));
+        }
+
+
+        [Fact]
+        public void AddDirty_With_RenderTransform_Call_RenderRoot_Invalidate()
+        {
+            var visual = new Mock<Visual>();
+            var child = new Mock<Visual>();
+            var renderRoot = visual.As<IRenderRoot>();
+
+            visual.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(0, 0, 400, 400));
+
+            child.As<IVisual>().Setup(v => v.Bounds).Returns(new Rect(100, 100, 100, 100));
+            child.As<IVisual>().Setup(v => v.VisualParent).Returns(visual.Object);
+            child.As<IVisual>().Setup(v => v.RenderTransform).Returns(new ScaleTransform() { ScaleX = 2, ScaleY = 2 });
+            child.As<IVisual>().Setup(v => v.RenderTransformOrigin).Returns(new RelativePoint(0.5, 0.5, RelativeUnit.Relative));
+            child.As<IVisual>().Setup(v => v.TransformToVisual(It.IsAny<IVisual>())).CallBase();
+
+            var target = new ImmediateRenderer(visual.Object);
+
+            target.AddDirty(child.Object);
+
+            renderRoot.Verify(v => v.Invalidate(new Rect(50, 50, 200, 200)));
+        }
+
+
+        public class TestVisual : Visual
+        {
+            public new Rect Bounds
+            {
+                get => base.Bounds;
+                set => base.Bounds = value;
+            }
+        }
+    }
+}