code: def test_wavelength_range_cf_roundtrip():
      """Test the wavelength range object roundtrip to cf."""
      wr = WavelengthRange(1, 2, 3)
  
      assert WavelengthRange.from_cf(wr.to_cf()) == wr
      assert WavelengthRange.from_cf([str(item) for item in wr]) == wr
  
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 24 for calling a global function with example usage: test_wavelength_range_cf_roundtrip() without return types