code: def test_get_all_bucket_keys(self):
      self.check_get_all_bucket_keys()
  
imports: import unittest
  import numpy
  import scipy
  from mockredis import MockRedis
  import mongomock
  from future.builtins import range
  from future.builtins import zip
  from nearpy.storage import MemoryStorage, RedisStorage, MongoStorage
label_desc: Use image node_id 4 for calling the MemoryStorageTest obj's underlying member method code with example usage: obj.test_get_all_bucket_keys() without return types