avoid deadlock

Author: doghappy

src/SocketIOClient/V2/SocketIO.cs

@@ -83,6 +83,7 @@ public async Task ConnectAsync(CancellationToken cancellationToken)
         // TODO: concurrent connect
         _connCompletionSource = new TaskCompletionSource<Exception>();
         _sessionCompletionSource = new TaskCompletionSource<bool>();
+        cancellationToken.Register(() => _connCompletionSource.SetResult(new TaskCanceledException()));
         _ = ConnectCoreAsync(cancellationToken).ConfigureAwait(false);
         var task = Task.Run(async () => await _connCompletionSource.Task.ConfigureAwait(false), cancellationToken);
         var ex = await task.ConfigureAwait(false);

tests/SocketIOClient.UnitTests/V2/SocketIOTests.cs

@@ -187,7 +187,7 @@ await _io
     }
 
     [Fact]
-    public async Task ConnectAsyncCancellationToken_CancelAfter200ms_ThrowConnectionException()
+    public async Task ConnectAsyncCancellationToken_CancelAfter100ms_ThrowOperationCanceledException()
     {
         _io.Options.Reconnection = true;
         _random.Next(Arg.Any<int>()).Returns(10);