class_docstr: Test converters to_zx and from_zx.
docstr: Test the QNode decorator.
docstr_tok: ["Test","the","QNode","decorator","."]
code: def test_qnode_decorator_no_params(self):
      """Test the QNode decorator."""
      dev = qml.device("default.qubit", wires=2)
  
      @partial(qml.transforms.to_zx, expand_measurements=True)
      @qml.qnode(device=dev)
      def circuit():
          qml.PauliZ(wires=0)
          qml.PauliX(wires=1)
          return qml.expval(qml.PauliZ(0) @ qml.PauliZ(1))
  
      g = circuit()
  
      assert isinstance(g, pyzx.graph.graph_s.GraphS)
  
imports: import sys
  from functools import partial
  import numpy
  import pytest
  import pennylane
  from pennylane.tape import QuantumScript
  from pennylane.transforms.op_transforms import OperationTransformError
label_desc: Use image node_id 16 for calling the TestConvertersZX obj's underlying member method code with example usage: obj.test_qnode_decorator_no_params() and returns: qml