fix test

Author: dmarek-flex

tests/test_components/test_microwave.py

@@ -663,10 +663,11 @@ def test_path_integral_factory_mixed_specs():
     impedance_spec1 = td.CustomImpedanceSpec(voltage_spec=v_spec, current_spec=None)
     impedance_spec2 = td.CustomImpedanceSpec(voltage_spec=None, current_spec=i_spec)
     microwave_mode_spec = td.MicrowaveModeSpec(
+        num_modes=2,
         impedance_specs=(
             impedance_spec1,
             impedance_spec2,
-        )
+        ),
     )
     voltage_integrals, current_integrals = make_path_integrals(microwave_mode_spec, mode_monitor)