ci: Add macOS desktop runtime tests

build/ci/.azure-devops-skia-tests.yml

@@ -448,3 +448,48 @@ jobs:
       testResultsFiles: '$(build.sourcesdirectory)/build/skia-linux-runtime-tests-results.xml'
       failTaskOnFailedTests: true
       failTaskOnMissingResultsFile: true
+
+- job: Skia_macos_Runtime_Tests_Build
+  displayName: 'Run Skia macOS Runtime Tests'
+  timeoutInMinutes: 60
+
+  pool:
+    vmImage: ${{ parameters.vmMacImage }}
+
+  dependsOn: Skia_Tests_Build
+
+  variables:
+    SamplesAppArtifactName: skia-generic-samples-app-$(XAML_FLAVOR_BUILD)
+    SamplesAppArtifactPath: $(build.sourcesdirectory)/build/$(SamplesAppArtifactName)
+
+    UNO_UWP_BUILD: ${{ parameters.UNO_UWP_BUILD }}
+    XAML_FLAVOR_BUILD: ${{ parameters.XAML_FLAVOR_BUILD }}
+
+  steps:
+
+  - template: templates/download-winui-converted-tree.yml
+
+  - task: DownloadBuildArtifacts@0
+    inputs:
+        artifactName: $(SamplesAppArtifactName)
+        downloadPath: '$(build.sourcesdirectory)/build'
+
+  - template: templates/dotnet-install.yml
+
+  - script: |
+        cd $(SamplesAppArtifactPath)
+        dotnet SamplesApp.Skia.Generic.dll --runtime-tests=$(build.sourcesdirectory)/build/skia-macos-runtime-tests-results.xml
+
+    displayName: Run Skia  $(XAML_FLAVOR_BUILD) Runtime Tests
+    env:
+      SamplesAppArtifactPath: $(SamplesAppArtifactPath)
+      SamplesAppArtifactName: $(SamplesAppArtifactName)
+
+  - task: PublishTestResults@2
+    condition: always()
+    inputs:
+      testRunTitle: 'Skia macOS $(XAML_FLAVOR_BUILD) Runtime Tests'
+      testResultsFormat: 'NUnit'
+      testResultsFiles: '$(build.sourcesdirectory)/build/skia-macos-runtime-tests-results.xml'
+      failTaskOnFailedTests: true
+      failTaskOnMissingResultsFile: true

src/Uno.UI.Runtime.Skia.MacOS/MacOSWindowWrapper.cs

@@ -57,6 +57,7 @@ protected override void ShowCore()
 	public override void Close()
 	{
 		NativeUno.uno_window_close(_window.Handle);
+		base.Close();
 	}
 
 	public override void Move(PointInt32 position)

src/Uno.UI.RuntimeTests/Helpers/ImageAssert.cs

@@ -258,16 +258,19 @@ private static async Task<bool> AreRenderTargetBitmapsEqualAsync(RenderTargetBit
 	/// If the error is greater than or equal to 0.022, the differences are visible to human eyes.
 	/// <paramref name="actual">The image to compare with reference</paramref>
 	/// <paramref name="expected">Reference image.</paramref>
-	/// <paramref name="imperceptibilityThreshold">It is the threshold beyond which the compared images are not considered equal. Default value is 0.022.</paramref>>
+	/// <paramref name="imperceptibilityThreshold">It is the threshold beyond which the compared images are not considered equal. Default value is 0.022.</paramref>
+	/// <paramref name="resolutionTolerance">Limits of resolution (in pixels) difference between the bitmaps</paramref>
 	/// </summary>
-	public static async Task AreSimilarAsync(RawBitmap actual, RawBitmap expected, double imperceptibilityThreshold = 0.022)
+	public static async Task AreSimilarAsync(RawBitmap actual, RawBitmap expected, double imperceptibilityThreshold = 0.022, int resolutionTolerance = 0)
 	{
 		await actual.Populate();
 		await expected.Populate();
 
 		using var assertionScope = new AssertionScope("ImageAssert");
 
-		if (actual.Width != expected.Width || actual.Height != expected.Height)
+		var dx = Math.Abs(actual.Width - expected.Width);
+		var dy = Math.Abs(actual.Height - expected.Height);
+		if (dx > resolutionTolerance || dy > resolutionTolerance)
 		{
 			assertionScope.FailWith($"Images have different resolutions. {Environment.NewLine}expected:({expected.Width},{expected.Height}){Environment.NewLine}actual  :({actual.Width},{actual.Height})");
 		}

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Controls/Given_ListViewBase.cs

@@ -1988,11 +1988,13 @@ string RandomString(int length)
 			// since this is originally a virtualization issue and references
 			// could be to different things than those shown on the screen.
 			var si = await UITestHelper.ScreenShot(list, true);
-			ImageAssert.HasColorAt(si, 70, 65, Colors.FromARGB("#1A69A6")); // selected
+			// on macOS/metal we get the color #1A6AA7 which is quite close but not identical
+			var tolerance = (byte)(OperatingSystem.IsMacOS() ? 1 : 0);
+			ImageAssert.HasColorAt(si, 70, 65, Colors.FromARGB("#1A69A6"), tolerance); // selected
 
 			// check starting from below the second item that nothing looks selected or hovered
-			ImageAssert.DoesNotHaveColorInRectangle(si, new Rectangle(100, 110, si.Width - 100, si.Height - 110), Colors.FromARGB("#1A69A6")); // selected
-			ImageAssert.DoesNotHaveColorInRectangle(si, new Rectangle(100, 110, si.Width - 100, si.Height - 110), Colors.FromARGB("#FFE6E6E6")); // hovered
+			ImageAssert.DoesNotHaveColorInRectangle(si, new Rectangle(100, 110, si.Width - 100, si.Height - 110), Colors.FromARGB("#1A69A6"), tolerance); // selected
+			ImageAssert.DoesNotHaveColorInRectangle(si, new Rectangle(100, 110, si.Width - 100, si.Height - 110), Colors.FromARGB("#FFE6E6E6"), tolerance); // hovered
 		}
 
 		[TestMethod]

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Controls/Given_TextBlock.cs

@@ -182,10 +182,8 @@ public async Task Check_FontFallback_Shaping()
 			await UITestHelper.Load(expected);
 			var screenshot2 = await UITestHelper.ScreenShot(expected);
 
-			Assert.AreEqual(screenshot2.Width, screenshot1.Width);
-			Assert.AreEqual(screenshot2.Height, screenshot1.Height);
-
-			await ImageAssert.AreSimilarAsync(screenshot1, screenshot2, imperceptibilityThreshold: 0.15);
+			// we tolerate a 2 pixels difference between the bitmaps due to font differences
+			await ImageAssert.AreSimilarAsync(screenshot1, screenshot2, imperceptibilityThreshold: 0.18, resolutionTolerance: 2);
 		}
 #endif
 
@@ -1264,7 +1262,8 @@ public async Task When_IsTextSelectionEnabled_Keyboard_SelectAll_Copy()
 			mouse.Release();
 			await WindowHelper.WaitForIdle();
 
-			SUT.SafeRaiseEvent(UIElement.KeyDownEvent, new KeyRoutedEventArgs(SUT, VirtualKey.A, VirtualKeyModifiers.Control));
+			var mod = OperatingSystem.IsMacOS() ? VirtualKeyModifiers.Windows : VirtualKeyModifiers.Control;
+			SUT.SafeRaiseEvent(UIElement.KeyDownEvent, new KeyRoutedEventArgs(SUT, VirtualKey.A, mod));
 			await WindowHelper.WaitForIdle();
 
 			var bitmap = await UITestHelper.ScreenShot(SUT);
@@ -1278,7 +1277,7 @@ public async Task When_IsTextSelectionEnabled_Keyboard_SelectAll_Copy()
 					SUT.SelectionHighlightColor.Color);
 			}
 
-			SUT.SafeRaiseEvent(UIElement.KeyDownEvent, new KeyRoutedEventArgs(SUT, VirtualKey.C, VirtualKeyModifiers.Control));
+			SUT.SafeRaiseEvent(UIElement.KeyDownEvent, new KeyRoutedEventArgs(SUT, VirtualKey.C, mod));
 			await WindowHelper.WaitForIdle();
 
 			Assert.AreEqual(SUT.Text, await Clipboard.GetContent()!.GetTextAsync());