Use proper AssemblyCleanup

Do not send close app message

Author: Rosuavio

UITests/UITests.App/App.AppService.xaml.cs

@@ -65,10 +65,6 @@ private async void OnAppServiceRequestReceived(AppServiceConnection sender, AppS
 
                     await args.Request.SendResponseAsync(pageResponse ? OkResult : BadResult);
 
-                    break;
-                case "Close":
-                    Current.Exit();
-                    await args.Request.SendResponseAsync(OkResult);
                     break;
                 default:
                     break;

UITests/UITests.Tests.Shared/TestAssembly.cs

@@ -36,8 +36,7 @@ public static void AssemblyInitialize(TestContext testContext)
         [AssemblyCleanup]
         public static void AssemblyCleanup()
         {
-            TestEnvironment.AssemblyCleanup();
-            CloseTestApp();
+            TestEnvironment.AssemblyCleanupWorker(UITestBase.WinUICsUWPSampleApp);
         }
 
         private static async Task InitalizeComService()
@@ -64,8 +63,6 @@ private static async Task InitalizeComService()
             }
         }
 
-        private static Task<bool> CloseTestApp() => SendMessageToApp(new () { { "Command", "Close" } });
-
         internal static Task<bool> OpenPage(string pageName)
         {
             Log.Comment("[Harness] Sending Host Page Request: {0}", pageName);