[Testing] Rework Catalyst Test Runner to use startup arguments instead of UI navigation

src/Controls/tests/TestCases.HostApp/MauiProgram.cs

@@ -64,6 +64,23 @@ public static Page CreateDefaultMainPage()
 		{
 			Page mainPage = null;
 			OverrideMainPage(ref mainPage);
+
+			// Check for startup test argument from environment variables (passed by test runner)
+			var testName = System.Environment.GetEnvironmentVariable("test");
+			if (!string.IsNullOrEmpty(testName))
+			{
+				App.StartupTestName = testName;
+
+				// Try to navigate directly to the test
+				var testCaseScreen = new TestCases.TestCaseScreen();
+				if (testCaseScreen.TryToNavigateTo(testName))
+				{
+					// If navigation succeeded, the page was already set by the action
+					// Return a dummy page that will be replaced
+					return new ContentPage { Title = "Loading Test..." };
+				}
+			}
+
 			return mainPage ?? new CoreNavigationPage();
 		}
 	}
@@ -78,6 +95,7 @@ public App()
 		}
 
 		public static bool PreloadTestCasesIssuesList { get; set; } = true;
+		public static string StartupTestName { get; set; }
 
 		protected override void OnAppLinkRequestReceived(Uri uri)
 		{

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs

@@ -17,8 +17,24 @@ public abstract class _IssuesUITest : UITest
 		protected const string BackButtonAutomationId = "Navigate up";
 #endif
 
+#if MACCATALYST
+		protected override bool ResetAfterEachTest => true;
+#endif
+
 		public _IssuesUITest(TestDevice device) : base(device) { }
 
+		public override IConfig GetTestConfig()
+		{
+			var config = base.GetTestConfig();
+
+#if MACCATALYST
+			// For Catalyst, pass the test name as a startup argument
+			config.SetTestConfigurationArg("test", Issue);
+#endif
+
+			return config;
+		}
+
 		protected override void FixtureSetup()
 		{
 			int retries = 0;
@@ -30,7 +46,14 @@ protected override void FixtureSetup()
 #if ANDROID || MACCATALYST
 					App.ToggleSystemAnimations(false);
 #endif
+#if !MACCATALYST
+					// For non-Catalyst platforms, navigate via UI
 					NavigateToIssue(Issue);
+#else
+					// For Catalyst, navigation is handled via startup arguments
+					// Just wait for the test to load
+					App.WaitForElement("*", timeout: TimeSpan.FromSeconds(10));
+#endif
 					break;
 				}
 				catch (Exception e)

src/TestUtils/src/UITest.Appium/AppiumCatalystApp.cs

@@ -65,6 +65,12 @@ private static AppiumOptions GetOptions(IConfig config)
 				options.AddAdditionalAppiumOption(IOSMobileCapabilityType.BundleId, appId);
 			}
 
+			var args = config.GetProperty<Dictionary<string, string>>("TestConfigurationArgs");
+			options.AddAdditionalAppiumOption(IOSMobileCapabilityType.ProcessArguments, new Dictionary<string, object>
+			{
+				{ "env", args! }
+			});
+
 			options.AddAdditionalAppiumOption("showServerLogs", true);
 			return options;
 		}