Convert Maui27202 and Maui28711 tests from NUnit to XUnit (dotnet#33061)

Author: PureWeen

src/Controls/tests/Xaml.UnitTests/Issues/Maui27202.xaml.cs

@@ -2,7 +2,7 @@
 using System.Linq;
 using Microsoft.Maui.Controls.Core.UnitTests;
 using Microsoft.Maui.Graphics;
-using NUnit.Framework;
+using Xunit;
 
 namespace Microsoft.Maui.Controls.Xaml.UnitTests;
 
@@ -15,33 +15,32 @@ public Maui27202(bool useCompiledXaml)
 		//this stub will be replaced at compile time
 	}
 
-	[TestFixture]
-	class Tests
+	[Collection("Issue")]
+	public class Tests : IDisposable
 	{
-		[SetUp]
-		public void Setup()
+		public Tests()
 		{
-			Application.Current = new MockApplication();
+			Application.SetCurrentApplication(new MockApplication());
 		}
 
-		[TearDown]
-		public void TearDown()
+		public void Dispose()
 		{
 			Application.Current = null;
 		}
 
-		[Test]
-		public void DerivedStylesInheritVisualStateManager([Values] XamlInflator inflator)
+		[Theory]
+		[XamlInflatorData]
+		internal void DerivedStylesInheritVisualStateManager(XamlInflator inflator)
 		{
 			var page = new Maui27202(inflator);
 
 			// Verify styles are applied
-			Assert.That(page.EnabledLabel1.TextColor, Is.EqualTo(Colors.Green));
+			Assert.Equal(Colors.Green, page.EnabledLabel1.TextColor);
 
 			// Verify VSG exists
 			var groups = VisualStateManager.GetVisualStateGroups(page.DisabledLabel1);
-			Assert.That(groups, Is.Not.Null);
-			Assert.That(groups.Count, Is.GreaterThan(0));
+			Assert.NotNull(groups);
+			Assert.True(groups.Count > 0);
 
 			// Check if GoToState succeeds
 			var gotoResult = VisualStateManager.GoToState(page.DisabledLabel1, "Disabled");
@@ -51,9 +50,8 @@ public void DerivedStylesInheritVisualStateManager([Values] XamlInflator inflato
 			Console.WriteLine($"TextColor after GoToState: {page.DisabledLabel1.TextColor}");
 			Console.WriteLine($"Expected: Gray ({Colors.Gray})");
 
-			Assert.That(gotoResult, Is.True, "GoToState should succeed");
-			Assert.That(page.DisabledLabel1.TextColor, Is.EqualTo(Colors.Gray),
-				"VSM Disabled state should override derived style TextColor");
+			Assert.True(gotoResult, "GoToState should succeed");
+			Assert.Equal(Colors.Gray, page.DisabledLabel1.TextColor);
 		}
 	}
 }

src/Controls/tests/Xaml.UnitTests/Issues/Maui28711.xaml.cs

@@ -1,28 +1,29 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 using Microsoft.Maui.Graphics;
-using NUnit.Framework;
+using Xunit;
 
 namespace Microsoft.Maui.Controls.Xaml.UnitTests;
 
 public partial class Maui28711 : ContentPage
 {
 	public Maui28711() => InitializeComponent();
 
-	[TestFixture]
-	class Tests
+	[Collection("Issue")]
+	public class Tests
 	{
-		[Test]
-		public void XNameOnResourceShouldNotCrash([Values] XamlInflator inflator)
+		[Theory]
+		[XamlInflatorData]
+		internal void XNameOnResourceShouldNotCrash(XamlInflator inflator)
 		{
 			// This test reproduces issue #28711
 			// When using x:Name on a SolidColorBrush in Resources, a NullReferenceException
 			// was thrown because GetHashCode was called before Color was set.
 			var page = new Maui28711(inflator);
 
-			Assert.That(page, Is.Not.Null);
-			Assert.That(page.namedBrush, Is.Not.Null);
-			Assert.That(page.namedBrush.Color, Is.EqualTo(Colors.Red));
+			Assert.NotNull(page);
+			Assert.NotNull(page.namedBrush);
+			Assert.Equal(Colors.Red, page.namedBrush.Color);
 		}
 	}
 }