class_docstr: Test the transform function (validate and dispatch).
docstr: Test that  valid transforms with non-valid co transform raises a Transform error.
code: def test_dispatcher_signature_classical_cotransform(
      self, valid_transform
  ):
      """Test that  valid transforms with non-valid co transform raises a Transform error."""
  
      with pytest.raises(
          TransformError,
          match="The classical co-transform must be a valid Python function.",
      ):
          transform(valid_transform, classical_cotransform=3)
  
imports: from typing import Sequence, Callable
  from functools import partial
  import pytest
  import pennylane
  from pennylane.transforms.core import transform, TransformError, TransformContainer
label_desc: Use image node_id 8 for calling the TestTransformDispatcher obj's underlying member method code with example usage: obj.test_dispatcher_signature_classical_cotransform(valid_transform) without return types