Quarantining CanDispatchAsyncWorkToSyncContext (#22803)

* Quarantining CanDispatchAsyncWorkToSyncContext

* Missing using

* Make method virtual

Author: sebastienros

src/Components/test/E2ETest/ServerExecutionTests/ServerComponentRenderingTest.cs

@@ -6,6 +6,7 @@
 using Microsoft.AspNetCore.Components.E2ETest.Infrastructure.ServerFixtures;
 using Microsoft.AspNetCore.Components.E2ETest.Tests;
 using Microsoft.AspNetCore.E2ETesting;
+using Microsoft.AspNetCore.Testing;
 using OpenQA.Selenium;
 using OpenQA.Selenium.Support.UI;
 using Xunit;
@@ -35,5 +36,10 @@ public void ThrowsIfRenderIsRequestedOutsideSyncContext()
                 $"{typeof(InvalidOperationException).FullName}: The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state.",
                 () => result.Text);
         }
+        
+        [Fact]
+        [Flaky("https://github.com/dotnet/aspnetcore-internal/issues/3615", FlakyOn.Helix.All)]
+        public override void CanDispatchAsyncWorkToSyncContext()
+            => base.CanDispatchAsyncWorkToSyncContext();        
     }
 }

src/Components/test/E2ETest/Tests/ComponentRenderingTest.cs

@@ -578,7 +578,7 @@ public void CanDoubleDispatchRenderToSyncContext()
         }
 
         [Fact]
-        public void CanDispatchAsyncWorkToSyncContext()
+        public virtual void CanDispatchAsyncWorkToSyncContext()
         {
             var appElement = Browser.MountTestComponent<DispatchingComponent>();
             var result = appElement.FindElement(By.Id("result"));