new_contents: import pytest
  from keras.utils.generic_utils import custom_object_scope
  from keras import activations
  from keras import regularizers
  
  
  def test_custom_objects_scope():
  
      def custom_fn():
          pass
  
      class CustomClass(object):
          pass
  
      with custom_object_scope({'CustomClass': CustomClass,
                                'custom_fn': custom_fn}):
          act = activations.get('custom_fn')
          assert act == custom_fn
          cl = regularizers.get('CustomClass')
          assert cl.__class__ == CustomClass
  
  
  if __name__ == '__main__':
      pytest.main([__file__])
  
subject: Add unit test for custom objects scope.