class_docstr: Unit tests for the ``transmon_interaction`` function.
docstr: Test that the attributes and the number of terms of the ``ParametrizedHamiltonian`` returned by
  ``transmon_interaction`` are correct.
docstr_tok: ["Test","that","the","attributes","and","the","number","of","terms","of","the","``","ParametrizedHamiltonian","``","returned","by","``","transmon_interaction","``","are","correct","."]
code: def test_attributes_and_number_of_terms(self):
      """Test that the attributes and the number of terms of the ``ParametrizedHamiltonian`` returned by
      ``transmon_interaction`` are correct."""
      Hd = transmon_interaction(
          connections=connections,
          qubit_freq=qubit_freq,
          coupling=coupling,
          anharmonicity=None,
          wires=wires,
          d=2,
      )
      settings = TransmonSettings(
          connections,
          qubit_freq,
          coupling,
          anharmonicity=[0.0] * len(wires),
      )
  
      assert isinstance(Hd, HardwareHamiltonian)
      assert Hd.settings == settings
      assert Hd.wires == Wires(wires)
  
      num_combinations = len(wires) + len(connections)
      assert len(Hd.ops) == num_combinations
      assert Hd.pulses == []
  
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 1 for calling the TestTransmonInteraction obj's underlying member method code with example usage: obj.test_attributes_and_number_of_terms() without return types