class_docstr: Unit tests for the ``transmon_interaction`` function.
docstr: Test that the generated coefficients are correct.
docstr_tok: ["Test","that","the","generated","coefficients","are","correct","."]
code: def test_coeffs(self):
      """Test that the generated coefficients are correct."""
      Hd = qml.pulse.transmon_interaction(
          qubit_freq,
          connections,
          coupling,
          wires=wires,
          anharmonicity=anharmonicity,
          d=2,
      )
      omega = 2 * np.pi * qubit_freq
      g = 2 * np.pi * coupling
      assert all(Hd.coeffs == np.concatenate([omega, g]))
  
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 2 for calling the TestTransmonInteraction obj's underlying member method code with example usage: obj.test_coeffs() without return types