code: def test_unparse(source, expected):
      module = ast.parse(source)
      assert ast_unparse(module.body[0].value, source) == expected
  
imports: import ast
  import pytest
  from sphinx.pycode.ast import unparse
label_desc: Use image node_id 1 for calling a global function with example usage: test_unparse(source, expected) without return types