def bucketExists(self, bucketName):
        assert False, "Subclasses implement"
generate_thumbnail does not fail if file doesn't actually exist.
dataset/ETHPy150Open ufora/ufora/ufora/distributed/S3/S3Interface.py/S3Interface.bucketExists--crossover with--dataset/ETHPy150Open mozilla/kitsune/kitsune/upload/tests/test_tasks.py/GenerateThumbnail.test_generate_deleted_file