def _getgroupname(line):
    return line.strip().split(GRPSTART)[-1]
Harness to test if the FrameSet.symmetric_difference call works properly.
dataset/ETHPy150Open landsat-pds/landsat_ingestor/ingestor/mtlutils.py/_getgroupname--crossover with--dataset/ETHPy150Open sqlboy/fileseq/test/run.py/TestFrameSet._check_symmetric_difference