def METHOD_NAME(self):
    # check GMFs in v3.11 format are readable
    d = os.path.dirname(case_master.__file__)
    ds = read(os.path.join(d, 'calc_311.hdf5'))
    gmf_df = ds.read_df('gmf_data', 'eid')
    self.assertEqual(len(gmf_df), 314)