code: def testAsyncCheckpointCachingVariable(self, distribution):
      del distribution
      with self.test_session():
          v = variables_lib.Variable(1.0)
          x = ps_values.CachingVariable(v)
          self.assertIsInstance(x, ps_values.CachingVariable)
          self.evaluate(x.initializer)
  
          async_checkpoint_test_helper(self, x)
  
file_path: tensorflow-upstream/tensorflow/python/distribute/ps_values_test.py
imports: import os
  from absl.testing import parameterized
  from tensorflow.python.checkpoint import checkpoint
  from tensorflow.python.checkpoint import checkpoint_options
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import ps_values
  from tensorflow.python.distribute import strategy_combinations
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import test
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.ops import variables
label_desc: Use image node_id 4 for calling the AggregatingVariableTest obj's underlying member method code with example usage: obj.testAsyncCheckpointCachingVariable(distribution) without return types