def METHOD_NAME():
    for _f in [_test_expr, _test_optional_expr]:
        f = args_converter.to_expr("arg", "args", "kwargs")(_f)
        for x in test_cases:
            f(
                x,
                x,  # the first argument in *args
                x,  # the second argument in *args
                test_kwargs=x,
            )
            if _f == _test_optional_expr:
                f(None, None, x, test_kwargs=None)