code: def test_frequency_quadruple_side_band_channel_equality():
      """Test the frequency quadruple side band object: check if two bands are 'equal'."""
      frq_qdsb = FrequencyQuadrupleSideBand(57, 0.322, 0.05, 0.036)
      assert frq_qdsb is not None
      assert frq_qdsb < FrequencyQuadrupleSideBand(
          57, 0.322, 0.05, 0.04
      )
      assert frq_qdsb < FrequencyQuadrupleSideBand(
          58, 0.322, 0.05, 0.036
      )
      assert frq_qdsb < ((58, 0.322, 0.05, 0.036))
      assert frq_qdsb > FrequencyQuadrupleSideBand(
          57, 0.322, 0.04, 0.01
      )
      assert frq_qdsb > None
      assert (frq_qdsb < None) is False
  
      assert 57 != frq_qdsb
      assert 57.372 == frq_qdsb
      assert 56.646 == frq_qdsb
      assert 56.71 == frq_qdsb
  
      assert frq_qdsb != FrequencyQuadrupleSideBand(
          57, 0.322, 0.1, 0.040
      )
  
      frq_qdsb = None
      assert (
          FrequencyQuadrupleSideBand(57, 0.322, 0.05, 0.036) != frq_qdsb
      )
      assert frq_qdsb < FrequencyQuadrupleSideBand(
          57, 0.322, 0.05, 0.04
      )
  
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 10 for calling a global function with example usage: test_frequency_quadruple_side_band_channel_equality() without return types