code: def test_ValidBz2File(self):
      try:
          import bz2
      except ImportError:
          # We don't have the bz2 capabilities to test.
          pytest.skip()
      # Test datasource's internal file_opener for BZip2 files.
      filepath = os.path.join(self.tmpdir, "foobar.txt.bz2")
      fp = bz2.BZ2File(filepath, "w")
      fp.write(magic_line)
      fp.close()
      fp = self.ds.open(filepath)
      result = fp.readline()
      fp.close()
      assert_equal(magic_line, result)
  
imports: import os
  import pytest
  from tempfile import mkdtemp, mkstemp, NamedTemporaryFile
  from shutil import rmtree
  import numpy.lib._datasource
  from numpy.testing import assert_, assert_equal, assert_raises
  import urllib.request
  from urllib.parse import urlparse
  from urllib.error import URLError
label_desc: Use image node_id 9 for calling the TestDataSourceOpen obj's underlying member method code with example usage: obj.test_ValidBz2File() without return types