def _get_credentials(self, method_frame):
"""Get credentials for authentication.
:param pika.frame.MethodFrame method_frame: The Connection.Start frame
:rtype: tuple(str, str)
"""
(auth_type,
response) = self.params.credentials.response_for(method_frame.method)
if not auth_type:
raise exceptions.AuthenticationError(self.params.credentials.TYPE)
self.params.credentials.erase_credentials()
return auth_type, response
def test_authentication_error_repr(self):
self.assertEqual(
repr(exceptions.AuthenticationError('PLAIN')),
'AuthenticationError: Server and client could not negotiate use of '
'the PLAIN authentication mechanism')