def test_upload_file_proxies_to_transfer_object(self): with mock.patch('boto3.s3.inject.S3Transfer') as transfer: inject.upload_file(mock.sentinel.CLIENT, Filename='filename', Bucket='bucket', Key='key') transfer.return_value.upload_file.assert_called_with( filename='filename', bucket='bucket', key='key', extra_args=None, callback=None)