code: def test__read_pdb_gz():
      """Test public _read_pdb with gzip files"""
      ppdb = PandasMmcif()
      path, txt = ppdb._read_mmcif(TESTDATA_FILENAME_GZ)
      assert txt == three_eiy
  
imports: import os
  from urllib.error import HTTPError
  from urllib.request import urlopen
  from pathlib import Path
  import numpy
  import pandas
  from biopandas.mmcif import PandasMmcif
  from biopandas.pdb import PandasPdb
  from biopandas.testutils import assert_raises
  from nose.tools import raises
  from pandas.testing import assert_frame_equal
label_desc: Use image node_id 5 for calling a global function with example usage: test__read_pdb_gz() without return types