def __test_invalid_input(data: str, msg: str, idx: int) -> None:
        with pytest.raises(sdjson.JSONDecodeError) as err:
                sdjson.loads(data)

        if PYPY:
                assert err.value.msg.startswith(msg)  # Fix for varying messages between PyPy versions
        else:
>               assert err.value.msg == msg
E     AssertionError: assert 'Illegal trai...end of object' == 'Expecting pr...double quotes'
E
E       - Expecting property name enclosed in double quotes
E       + Illegal trailing comma before end of object