### Question:
RegistrationLevelManagementImpl implements RegistrationLevelManagementService { @Override public CommonResult updateRegistrationLevelById(RegistrationLevel registrationLevel) { if (registrationLevelMapper.get(registrationLevel.getId()) == null) { return CommonResult.fail(E_602); } int count = registrationLevelMapper.update(registrationLevel); if (count == 0) { return CommonResult.fail(); } return CommonResult.success(count); }  @Override CommonResult getRegistrationLevelById(Short id); @Override CommonResult insertRegistrationLevel(RegistrationLevel registrationLevel); @Override CommonResult updateRegistrationLevelById(RegistrationLevel registrationLevel); @Override CommonResult deleteRegistrationLevelById(Short id); @Override CommonResult listAllRegistrationLevels();  }### Answer:
@Test public void testUpdateRegistrationLevelById() throws Exception { }