class_docstr: Test cancel inverses on tape, qfunc and QNode.
class_docstr_tok: ["Test","cancel","inverses","on","tape",",","qfunc","and","QNode","."]
docstr: Test the transform on a qnode directly.
docstr_tok: ["Test","the","transform","on","a","qnode","directly","."]
code: def test_qnode(self):
      """Test the transform on a qnode directly."""
      transformed_qnode = cancel_inverses(qnode_circuit)
      assert not transformed_qnode.transform_program.is_empty()
      assert len(transformed_qnode.transform_program) == 1
      params = [0.1, 0.2]
      res = transformed_qnode(params)
      expected = qnode_circuit(params)
      assert np.allclose(res, expected)
  
imports: import pytest
  from utils import compare_operation_lists
  import pennylane
  from pennylane import numpy
  from pennylane.wires import Wires
  from pennylane.transforms.optimization import cancel_inverses
label_desc: Use image node_id 3 for calling the TestTransformDispatch obj's underlying member method code with example usage: obj.test_qnode() without return types