public void TestAuthSpecificMechanismAlreadyExchanged()
        {
            using (var authMechanism = new SaslPseudoMechanism(false, 2)) {
            byte[] clientResponse;

            authMechanism.Exchange(null, out clientResponse);

            Assert.AreNotEqual(SaslExchangeStatus.None,
                           authMechanism.ExchangeStatus);

            AuthSpecificMechanism(authMechanism);
              }
        }