PowerMockito单元测试(2)-返回void的方法测试覆盖

  

2. 返回void的测试覆盖

 【要测试的方法】：

@Component
public class UserDao{
     
	@Autowired
	private UserMapper userMapper
	@Autowired
	private SystemErrorRecoder systemErrorRecoder
	
	public void putUser(UserDTO userDto){
     
		try{
     
			userMapper.putUser(userDto);
		}catch(DataAccessException e){
     
			systemErrorRecoder.addMsgError(e.getMessage());
		}
	}
}

 【测试方法】：

@RunWith(PowerMockRunner.class)	// 必要，确保使用PowerMock框架引擎执行单元测试
@PowerMockIgnore("javax.management.*")//解决报错previously initiated loading for different type with name "javax/managemen
public class UserDaoTest[
	private UserDao userDao;
	private	UserMapper userMappers;
	private	SystemErrorRecoder systemErrorRecoder;
	
	@Before//在@Test代码执行前执行，用于初始化
	public void setUp(){
     
		userDao = new UserDao();
		userMappers = PowerMockito.mock(UserMapper.class)；//mock获得UserMapper类的代理对象
 		systemErrorRecoder = PowerMockito.mock(SystemErrorRecoder.class)；
		Whitebox.setInternalState(userDao,"userMapper",userMappers)；//为本类的userDao对象的私有属性userMapper赋值userMappers
		Whitebox.setInternalState(userDao,"systemErrorRecoder",systemErrorRecoder)；
	}
	
	@Test
	public void testPutUser(){
     
		UserDTO user = new UserDTO();
		PowerMockito.doNothing().when(userMappers).putUser(Mockito.any(UserDTO.class));  //主要代码
		userDao.putUser(user);
		Mockito.verify(userMappers).putUser(Mockito.any(UserDTO.class));
		
		//a.对异常打桩
		DataAccessException exception = PowerMockito.mock(DataAccessException.class);
		//b.模拟try内的方法，doThrow异常
		PowerMockito.doThrow(exception).when(userMappers).putUser(Mockito.any(UserDTO.class));
		//c.模拟catch内的方法（如果catch内不涉及别的方法，可以省略）
		PowerMockito.doNothing().when(systemErrorRecoder).addMsgError(Mockito.anyString())
		//d.verify验证
		userDao.putUser(user);
		Mockito.verify(systemErrorRecoder).addMsgError(Mockito.anyString());

 【要点】：（主要思想可参考：PowerMockito主要思想以及常规异常覆盖）

   返回void的方法，可通过doNothing来进行打桩测试，没有返回值，就没法断言验证，那怎么知道执行正确与否？

   在不触发异常的情况下，userDao.putUser(user);执行完，意味着userMappers.putUser执行完

   所以，通过Mockito.verify来验证userMappers.putUser是否被执行过；
    被执行了，就能说明userDao.putUser(user);执行正确

   所以，要知道真实方法执行完后，执行到了哪来，尽量的与代理方法相关联来验证，实在没有那就不验证了。