code: def test_module_node(self, transformer):
      node = ast.parse("")
  
      transformed_node = transformer.visit(node)
  
      assert transformed_node.parent is None
      assert transformed_node.children == []
  
file_path: astmonkey/astmonkey/tests/test_transformers.py
imports: import pytest
  import ast
  from astmonkey import transformers
label_desc: Use image node_id 2 for calling the TestParentChildNodeTransformer obj's underlying member method code with example usage: obj.test_module_node(transformer) without return types