class_docstr: Base class for storage tests.
code: def check_get_all_bucket_keys(self):
      x, x_data = numpy.ones(100), "data"
      hash_config = [
          ("firstHash", ["1", "2", "3", "4"]),
          ("secondHash", ["10", "20", "3", "4", "50"]),
      ]
      for hash_name, bucket_keys in hash_config:
          for bucket_key in bucket_keys:
              self.storage.store_vector(
                  hash_name, bucket_key, x, x_data
              )
      for hash_name, bucket_keys in hash_config:
          self.assertSequenceEqual(
              sorted(self.storage.get_all_bucket_keys(hash_name)),
              sorted(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 StorageTest obj's underlying member method code with example usage: obj.check_get_all_bucket_keys() without return types