class_docstr: Test the area helpers.
docstr: Test the generic_open method with bz2 filename input.
code: def test_generic_open_BZ2File(self, bz2_mock):
      """Test the generic_open method with bz2 filename input."""
      mock_bz2_open = mock.MagicMock()
      mock_bz2_open.read.return_value = b"TEST"
      bz2_mock.return_value = mock_bz2_open
  
      filename = "tester.DAT.bz2"
      with hf.generic_open(filename) as file_object:
          data = file_object.read()
          assert data == b"TEST"
  
      assert mock_bz2_open.read.called
  
imports: import os
  import unittest
  from datetime import datetime
  from unittest import mock
  import dask.array
  import numpy
  import numpy.testing
  import pyresample.geometry
  import pytest
  import xarray
  from fsspec.implementations.memory import MemoryFile, MemoryFileSystem
  from pyproj import CRS
  from satpy.readers import FSFile
  from satpy.readers import utils
label_desc: Use image node_id 10 for calling the TestHelpers obj's underlying member method code with example usage: obj.test_generic_open_BZ2File(bz2_mock) without return types