def METHOD_NAME(cls):
    cls.plain_outdir = os.path.join(
        test_files, "Si_structure_optimization_plain", "outputs"
    )
    cls.gzip_outdir = os.path.join(
        test_files, "Si_structure_optimization", "outputs"
    )
    cls.relax2_outdir = os.path.join(
        test_files, "Si_structure_optimization_relax2", "outputs"
    )
    cls.nokpts_outdir = os.path.join(
        test_files, "Si_structure_optimization", "outputs_no_kpts"
    )