[mt][browser] SignalRClientTests avoid timeouts (#99303)

* Avoid closing server before client is closed.

* Follow up for prev commit

* Exit client only.

* Remove blocking after merge.

---------

Co-authored-by: Jan Kotas <[email protected]>

Author: ilonatommy

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/SignalRClientTests.cs

@@ -24,7 +24,6 @@ public SignalRClientTests(ITestOutputHelper output, SharedBuildPerTestClassFixtu
     }
 
     [ConditionalTheory(typeof(BuildTestBase), nameof(IsWorkloadWithMultiThreadingForDefaultFramework))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/99268", TestPlatforms.Windows)]
     [InlineData("Debug", "LongPolling")]
     [InlineData("Release", "LongPolling")]
     [InlineData("Debug", "WebSockets")]

src/mono/wasm/testassets/BlazorHostedApp/BlazorHosted.Client/Pages/Chat.razor

@@ -84,10 +84,7 @@
 
     private async Task SendExitSignal()
     {
-        // exit the server
-        await _hubConnection.SendAsync("Exit", 0);
         await DisposeHubConnection();
-        Helper.TestOutputWriteLine($"Exit signal was sent by CurrentManagedThreadId={Environment.CurrentManagedThreadId}");
         // exit the client
         await JSRuntime.InvokeVoidAsync("eval", "import('./dotnet.js').then(module => { module.dotnet; module.exit(0); });");
     }

src/mono/wasm/testassets/BlazorHostedApp/BlazorHosted.Server/ChatHub.cs

@@ -12,10 +12,4 @@ public async Task SendMessage(string message, int sendingThreadId)
         string changedMessage = $"{message}-pong";
         await Clients.All.SendAsync("ReceiveMessage", changedMessage).ConfigureAwait(false);
     }
-
-    public void Exit(int code)
-    {
-        Console.WriteLine($"Received exit code {code} from client.");
-        Environment.Exit(code);
-    }
 }