code: def test_frequency_quadruple_side_band_class_method_convert():
      """Test the frequency double side band object: test the class method convert."""
      frq_qdsb = FrequencyQuadrupleSideBand(57, 0.322, 0.05, 0.036)
  
      res = frq_qdsb.convert(57.37)
      assert res == 57.37
  
      res = frq_qdsb.convert(
          {
              "central": 57.0,
              "side": 0.322,
              "sideside": 0.05,
              "bandwidth": 0.036,
          }
      )
      assert res == FrequencyQuadrupleSideBand(57, 0.322, 0.05, 0.036)
  
imports: import unittest
  from datetime import datetime
  import numpy
  import pytest
  from satpy.dataset.dataid import DataID, DataQuery, ModifierTuple, WavelengthRange, minimal_default_keys_config
  from satpy.readers.pmw_channels_definitions import FrequencyDoubleSideBand, FrequencyQuadrupleSideBand, FrequencyRange
  from satpy.tests.utils import make_cid, make_dataid, make_dsq
label_desc: Use image node_id 8 for calling a global function with example usage: test_frequency_quadruple_side_band_class_method_convert() without return types