elif options.authtype == "kerberos" or has_krb_creds() and options.authtype is None:

          try:

              if getattr(options, 'keytab', None) and getattr(options, 'principal', None):

              else:

          except socket.error as e:

              warn(_("Could not connect to Kerberos authentication service: %s") % e.args[1])

      if not noauth and not session.logged_in:

          error(_("Unable to log in, no authentication methods available"))

      ensure_connection(session)

          session.login.assert_not_called()

          session.ssl_login.assert_not_called()

          session.krb_login.assert_not_called()

      def test_activate_session_ssl(self):

          session = mock.MagicMock()

                      proxyuser=None)

          session.login.assert_not_called()

          session.krb_login.assert_not_called()

      def test_activate_session_ssl_implicit(self):

          session = mock.MagicMock()

                      proxyuser=None)

          session.login.assert_not_called()

          session.krb_login.assert_not_called()

      def test_activate_session_pw(self):

          session = mock.MagicMock()

          session.login.assert_called_once_with()

          session.ssl_login.assert_not_called()

          session.krb_login.assert_not_called()

      def test_activate_session_pw_implicit(self):

          session = mock.MagicMock()

          session.login.assert_called_once_with()

          session.ssl_login.assert_not_called()

          session.krb_login.assert_not_called()

      def test_activate_session_krb(self):

          session = mock.MagicMock()

          activate_session(session, options)

          session.login.assert_not_called()

          session.ssl_login.assert_not_called()

      def test_activate_session_krb_implicit(self):

          session = mock.MagicMock()

          activate_session(session, options)

          session.login.assert_not_called()

          session.ssl_login.assert_not_called()

      def test_activate_session_krb_keytab(self):

          session = mock.MagicMock()

          activate_session(session, options)

          session.login.assert_not_called()

          session.ssl_login.assert_not_called()

                      keytab='KEYTAB', proxyuser=None)

      def test_activate_session_no_method(self):

          session.login.assert_not_called()

          session.ssl_login.assert_not_called()

          session.krb_login.assert_not_called()

          self.error.assert_called_once()