test(aot): add tests for AOT compatibility with enum arguments to pre…

…vent IL3050 warnings

tools/tunit-nuget-tester/TUnit.NugetTester/TUnit.NugetTester/AotCompatibilityTests.cs

@@ -0,0 +1,38 @@
+namespace TUnit.NugetTester;
+
+/// <summary>
+/// Tests for issue #3321 - AOT analysis warnings when using enums in Arguments attribute
+/// This test verifies that no IL3050 warnings are emitted when PublishAot is enabled
+///
+/// Per the issue report, code like this was triggering warnings:
+/// - [Arguments(Enum1.Value1)] with enums
+///
+/// The warning was:
+/// - IL3050: Using Array.CreateInstance which requires dynamic code
+///
+/// This has been suppressed in CastHelper.cs with an UnconditionalSuppressMessage
+/// since the array creation happens at test discovery time, not during AOT-compiled execution.
+///
+/// Note: MatrixDataSource is intentionally NOT AOT-compatible and is marked with
+/// RequiresUnreferencedCode/RequiresDynamicCode attributes.
+/// </summary>
+public class AotCompatibilityTests
+{
+    public enum TestEnum
+    {
+        Value1,
+        Value2,
+        Value3
+    }
+
+    // Test from issue #3321 - enum parameters in Arguments attribute
+    [Test]
+    [Arguments(TestEnum.Value1)]
+    [Arguments(TestEnum.Value2)]
+    [Arguments(TestEnum.Value3)]
+    public async Task EnumArguments_ShouldNotTriggerAotWarnings(TestEnum enumValue)
+    {
+        // This test verifies that using enum values in Arguments doesn't trigger IL3050
+        await Assert.That(enumValue).IsDefined();
+    }
+}