docstr: Test that the matrix of a Hamiltonian is correctly returned
code: def test_hamiltonian(self):
      """Test that the matrix of a Hamiltonian is correctly returned"""
      ham = qml.PauliZ(0) @ qml.PauliY(1) - 0.5 * qml.PauliX(1)
      mat = qml.matrix(ham, wire_order=[1, 0, 2])
      expected = reduce(np.kron, [Y, Z, I]) - 0.5 * 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 11 for calling the TestSingleOperation obj's underlying member method code with example usage: obj.test_hamiltonian() without return types