class_docstr: Test case for the file reading.
docstr: Fake unzipping.
docstr_tok: ["Fake","unzipping","."]
code: def new_unzip(fname):
      """Fake unzipping."""
      if fname[-3:] == "bz2":
          return fname[:-4]
  
imports: import os
  import shutil
  import tempfile
  import unittest
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  from pyresample.geometry import AreaDefinition
  from satpy.readers.ahi_l1b_gridded_bin import AHI_LUT_NAMES, AHIGriddedFileHandler
label_desc: Use image node_id 1 for calling the TestAHIGriddedFileHandler obj's underlying member method code with example usage: obj.new_unzip(fname) and returns: fname