docstr: Test that the matrix of a Hamiltonian is correctly returned
code: def test_hamiltonian_qfunc(self):
      """Test that the matrix of a Hamiltonian is correctly returned"""
  
      def ansatz(x):
          return qml.PauliZ(0) @ qml.PauliY(1) - x * qml.PauliX(1)
  
      x = 0.5
      mat = qml.matrix(ansatz, wire_order=[1, 0, 2])(x)
      expected = reduce(np.kron, [Y, Z, I]) - x * np.kron(X, np.eye(4))
      assert qml.math.allclose(mat, expected)
  
imports: from functools import reduce, partial
  from warnings import catch_warnings
  import pytest
  from gate_data import I, X, Y, Z, H, S, CNOT, Rotx, Roty
  import pennylane
  from pennylane import numpy
  from pennylane.transforms.op_transforms import OperationTransformError
label_desc: Use image node_id 12 for calling the TestSingleOperation obj's underlying member method code with example usage: obj.test_hamiltonian_qfunc() and returns: unknown