class_docstr: Test that arithmetic operations involving or creating ParametrizedHamiltonians behave as expected
docstr: Test the __mul__ dunder method with a scalar.
docstr_tok: ["Test","the","__mul__","dunder","method","with","a","scalar","."]
code: def test_multiply_with_scalar(self):
      """Test the __mul__ dunder method with a scalar."""
      H = ParametrizedHamiltonian(
          [f1, f2], [qml.PauliX(0), qml.PauliY(1)]
      )
      new_H = 3 * H
      expected_H = ParametrizedHamiltonian(
          [lambda p, t: 3 * f1(p, t), lambda p, t: 3 * f2(p, t)],
          [qml.PauliX(0), qml.PauliY(1)],
      )
      assert new_H.H_fixed() == expected_H.H_fixed() == 0
      assert qml.equal(
          new_H.H_parametrized([1, 2], t=4),
          expected_H.H_parametrized([1, 2], t=4),
      )
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.pulse import ParametrizedHamiltonian
  from pennylane.wires import Wires
label_desc: Use image node_id 4 for calling the TestInteractionWithOperators obj's underlying member method code with example usage: obj.test_multiply_with_scalar() without return types