code: def test_check_callable(self) -> None:
      source = "warnings.warn('w1', RuntimeWarning)"
      with pytest.raises(TypeError, match=r".* must be callable"):
          pytest.warns(RuntimeWarning, source)
  
imports: import warnings
  from typing import List
  from typing import Optional
  from typing import Type
  import pytest
  from _pytest.pytester import Pytester
  from _pytest.recwarn import WarningsRecorder
label_desc: Use image node_id 1 for calling the TestWarns obj's underlying member method code with example usage: obj.test_check_callable() without return types