### Question:
RegistrationLevelManagementImpl implements RegistrationLevelManagementService { @Override public CommonResult listAllRegistrationLevels() { List<RegistrationLevel> list = registrationLevelMapper.list(); return CommonResult.success(list); }  @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 testListAllRegistrationLevels() throws Exception { }