public void DefaultTransportFactoryThrowsIfItCannotCreateRequestedTransport_Win7(TransportType requestedTransport)
        {
            if (!TestHelpers.IsWebSocketsSupported())
            {
                var transportFactory =
                    new DefaultTransportFactory(requestedTransport, loggerFactory: null, httpClient: new HttpClient());
                var ex = Assert.Throws <InvalidOperationException>(
                    () => transportFactory.CreateTransport(TransportType.All));

                Assert.Equal("No requested transports available on the server.", ex.Message);
            }
        }