code: def test_dummy_context_manager():
      """Just checks that dummy_context_manager doesn't crash"""
      from deepchem.utils.differentiation_utils import (
          dummy_context_manager,
      )
  
      with dummy_context_manager() as x:
          if x is None:
              pass
          else:
              raise AssertionError()
  
imports: import pytest
label_desc: Use image node_id 24 for calling a global function with example usage: test_dummy_context_manager() without return types