def test__build_kwargs(self): creds = Credentials(aws_secret_access_key='my_key', aws_access_key_id='my_id') self.assertDictEqual(creds._build_kwargs(), { 'aws_secret_access_key': 'my_key', 'aws_access_key_id': 'my_id' }) creds = Credentials(aws_secret_access_key='my_key', aws_access_key_id='my_id', aws_session_token='my_token') self.assertDictEqual(creds._build_kwargs(), { 'aws_secret_access_key': 'my_key', 'aws_access_key_id': 'my_id', 'aws_session_token': 'my_token' })