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 qfunc inside a qnode.
docstr_tok: ["Test","the","transform","on","a","qfunc","inside","a","qnode","."]
code: def test_qfunc(self):
      """Test the transform on a qfunc inside a qnode."""
  
      @qml.qnode(device=dev)
      def new_circuit(a):
          cancel_inverses(qfunc_circuit)(a)
          return qml.expval(qml.PauliX(0) @ qml.PauliX(2))
  
      new_circuit([0.1, 0.2])
      assert len(new_circuit.tape.operations) == 5
  
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 2 for calling the TestTransformDispatch obj's underlying member method code with example usage: obj.test_qfunc() and returns: qml