class_docstr: Test VIRR L1B Reader.
class_docstr_tok: ["Test","VIRR","L1B","Reader","."]
code: def _band_helper(
      self,
      attributes,
      units,
      calibration,
      standard_name,
      file_type,
      band_index_size,
      resolution,
  ):
      assert units == attributes["units"]
      assert calibration == attributes["calibration"]
      assert standard_name == attributes["standard_name"]
      assert file_type == attributes["file_type"]
      assert (
          attributes["band_index"] in range(band_index_size)
      ) is True
      assert resolution == attributes["resolution"]
      assert ("longitude", "latitude") == attributes["coordinates"]
  
imports: import os
  import unittest
  from unittest import mock
  import dask.array
  import numpy
  import xarray
  from satpy.tests.reader_tests.test_hdf5_utils import FakeHDF5FileHandler
label_desc: Use image node_id 3 for calling the TestVIRRL1BReader obj's underlying member method code with example usage: obj._band_helper(attributes, units, calibration, standard_name, file_type, band_index_size, resolution) without return types