public void TestLogoutInNonAuthenticatedState()
        {
            server.EnqueueResponse("* OK ImapSimulatedServer ready\r\n");
              server.EnqueueResponse("* BYE Logging out\r\n" +
                             "0000 OK logged out.\r\n");

              using (var session = new ImapSession(host, port)) {
            Assert.IsTrue(session.Logout().Code == ImapCommandResultCode.Bye);

            Assert.AreEqual(ImapSessionState.NotConnected, session.State);
            Assert.AreEqual(null, session.Authority);
              }
        }