Added test case

Author: HarishwaranVijayakumar

src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj

@@ -66,6 +66,7 @@
     <MauiFont Include="Resources\Fonts\**" />
     <MauiFont Remove="Resources\Fonts\Dokdo-Regular.ttf" />
     <EmbeddedResource Include="Resources\Fonts\Dokdo-Regular.ttf" />
+    <EmbeddedResource Include="Resources\Images\royals.png" />
     <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
   </ItemGroup>
 

src/Controls/tests/TestCases.HostApp/Issues/Issue19642.cs

@@ -0,0 +1,46 @@
+using System.Reflection;
+using IImage = Microsoft.Maui.Graphics.IImage;
+using Microsoft.Maui.Graphics.Platform;
+
+namespace Maui.Controls.Sample.Issues;
+
+
+[Issue(IssueTracker.Github, 19642, "NullReferenceException when using ImagePaint on Mac/iOS", PlatformAffected.iOS | PlatformAffected.macOS)]
+public class Issue19642 : TestContentPage
+{
+	Issue19642_ImagePaintDrawable _drawable;
+	VerticalStackLayout rootLayout;
+	Label _descriptionLabel;
+
+	protected override void Init()
+	{
+		rootLayout = new VerticalStackLayout();
+		GraphicsView graphicsView = new GraphicsView() { HeightRequest = 500, WidthRequest = 400 };
+		_drawable = new Issue19642_ImagePaintDrawable();
+		_descriptionLabel = new Label() { AutomationId = "TestLabel", Text = "The image should be displayed and should not be inverted. If the image is inverted or not displayed, the test has failed." };
+
+		graphicsView.Drawable = _drawable;
+		rootLayout.Add(graphicsView);
+		rootLayout.Add(_descriptionLabel);
+		Content = rootLayout;
+	}
+}
+
+internal class Issue19642_ImagePaintDrawable : IDrawable
+{
+	public void Draw(ICanvas canvas, RectF dirtyRect)
+	{
+		IImage image;
+		var assembly = GetType().GetTypeInfo().Assembly;
+		using (var stream = assembly.GetManifestResourceStream("Controls.TestCases.HostApp.Resources.Images.royals.png"))
+		{
+			image = PlatformImage.FromStream(stream);
+		}
+
+		if (image is not null)
+		{
+			canvas.SetFillImage(image.Downsize(100));
+			canvas.FillRectangle(0, 0, 240, 300);
+		}
+	}
+}

src/Controls/tests/TestCases.HostApp/Resources/Images/royals.png

@@ -0,0 +1,24 @@
+#if TEST_FAILS_ON_MACCATALYST || TEST_FAILS_ON_IOS //Issue link - https://github.com/dotnet/maui/issues/19642
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue19642 : _IssuesUITest
+{
+	public Issue19642(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	public override string Issue => "NullReferenceException when using ImagePaint on Mac/iOS";
+
+	[Test]
+	[Category(UITestCategories.GraphicsView)]
+	public void ImagePaintShouldBeDrawn()
+	{
+		App.WaitForElement("TestLabel");
+		VerifyScreenshot();
+	}
+}
+#endif