Mark tests as flaky (#19415)

* Mark tests as flaky

* Update ComponentHubReliabilityTest.cs

* Update InteropReliabilityTests.cs

* Update ServerComponentRenderingTest.cs

* Update ServerComponentRenderingTest.cs

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

@@ -2,14 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
-using System.Text.Json;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
-using Ignitor;
 using Microsoft.AspNetCore.Components.E2ETest.Infrastructure.ServerFixtures;
-using Microsoft.AspNetCore.Components.RenderTree;
-using Microsoft.AspNetCore.Components.Web;
 using Microsoft.AspNetCore.SignalR.Client;
 using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Logging;
@@ -27,6 +22,7 @@ namespace Microsoft.AspNetCore.Components.E2ETest.ServerExecutionTests
         }
 
         [Fact]
+        [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/19414")]
         public async Task CannotStartMultipleCircuits()
         {
             // Arrange

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

@@ -11,6 +11,7 @@ using Microsoft.AspNetCore.Components.E2ETest.Infrastructure.ServerFixtures;
 using Microsoft.AspNetCore.Components.RenderTree;
 using Microsoft.AspNetCore.Components.Web;
 using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Logging;
 using TestServer;
 using Xunit;
@@ -213,6 +214,7 @@ namespace Microsoft.AspNetCore.Components.E2ETest.ServerExecutionTests
         }
 
         [Fact]
+        [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/19410")]
         public async Task ContinuesWorkingAfterInvalidAsyncReturnCallback()
         {
             // Arrange

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

@@ -6,8 +6,8 @@ using BasicTestApp;
 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;
 using Xunit.Abstractions;
 
@@ -35,5 +35,10 @@ namespace Microsoft.AspNetCore.Components.E2ETest.ServerExecutionTests
                 $"{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]
+        [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/19413")]
+        public override void CanDispatchAsyncWorkToSyncContext()
+            => base.CanDispatchAsyncWorkToSyncContext();
     }
 }

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

@@ -12,6 +12,7 @@ using BasicTestApp.HierarchicalImportsTest.Subdir;
 using Microsoft.AspNetCore.Components.E2ETest.Infrastructure;
 using Microsoft.AspNetCore.Components.E2ETest.Infrastructure.ServerFixtures;
 using Microsoft.AspNetCore.E2ETesting;
+using Microsoft.AspNetCore.Testing;
 using OpenQA.Selenium;
 using OpenQA.Selenium.Support.UI;
 using Xunit;
@@ -579,7 +580,7 @@ namespace Microsoft.AspNetCore.Components.E2ETest.Tests
         }
 
         [Fact]
-        public void CanDispatchAsyncWorkToSyncContext()
+        public virtual void CanDispatchAsyncWorkToSyncContext()
         {
             var appElement = Browser.MountTestComponent<DispatchingComponent>();
             var result = appElement.FindElement(By.Id("result"));