code: def __call__(self, *args, **kwargs):
      ret = self.target(*args, **kwargs)
      self.retvals.append(ret)
      return ret
  
imports: import unittest
  from unittest import mock
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 2 for calling the CreateMock obj's underlying member method code with example usage: obj.__call__() and returns: ret