no exception should be thrown when a close message is received

Author: doghappy

src/SocketIOClient/Protocol/WebSocket/WebSocketAdapter.cs

@@ -37,6 +37,8 @@ private async Task ReceiveAsync(CancellationToken cancellationToken)
                         protocolMessage.Type = ProtocolMessageType.Bytes;
                         protocolMessage.Bytes = message.Bytes;
                         break;
+                    case WebSocketMessageType.Close:
+                        return;
                 }
 
                 await OnNextAsync(protocolMessage).ConfigureAwait(false);

tests/SocketIOClient.UnitTests/Protocol/WebSocket/WebSocketAdapterTests.cs

@@ -178,6 +178,8 @@ public async Task ReceiveAsync_ExceptionOccurred_OnDisconnectInvoked()
     [Fact]
     public async Task ReceiveAsync_CloseMessage_OnDisconnectNotInvoked()
     {
+        var observer = Substitute.For<IMyObserver<ProtocolMessage>>();
+        _wsAdapter.Subscribe(observer);
         _clientAdapter.ReceiveAsync(Arg.Any<CancellationToken>())
            .Returns(async _ =>
            {
@@ -192,6 +194,7 @@ public async Task ReceiveAsync_CloseMessage_OnDisconnectNotInvoked()
 
         await Task.Delay(200).ConfigureAwait(false);
         _onDisconnect.DidNotReceive().Invoke();
+        await observer.DidNotReceive().OnNextAsync(Arg.Any<ProtocolMessage>());
     }
 
     [Fact]