class_docstr: Unit tests for the ``transmon_interaction`` function.
docstr: Test that the matrices of the transmon drive and a manually constructed
  operator with the same functional form are equal.
docstr_tok: ["Test","that","the","matrices","of","the","transmon","drive","and","a","manually","constructed","operator","with","the","same","functional","form","are","equal","."]
code: def test_functional_form(self):
      """Test that the matrices of the transmon drive and a manually constructed
      operator with the same functional form are equal."""
      Hd = transmon_drive(1.0, 1.0, 1.0, wires=[0])
      expected = qml.s_prod(
          2 * np.pi * np.sin(2 * np.pi * 1.0 + 1), qml.PauliY(0)
      )
  
      assert qml.math.allclose(
          qml.matrix(Hd([], 1.0)), qml.matrix(expected)
      )
  
imports: import numpy
  import pytest
  import pennylane
  from pennylane.pulse import HardwareHamiltonian, transmon_interaction, transmon_drive
  from pennylane.pulse.transmon import TransmonSettings, a, ad, AmplitudeAndPhaseAndFreq, _reorder_AmpPhaseFreq, callable_freq_to_angular
  from pennylane.pulse.hardware_hamiltonian import HardwarePulse
  from pennylane.wires import Wires
label_desc: Use image node_id 10 for calling the TestTransmonInteraction obj's underlying member method code with example usage: obj.test_functional_form() without return types