模拟的存储库返回null

在您的情况下，测试应该看起来像(还没有编译，只是向您展示想法)public class UserServiceTest { @InjectMocks UserService userService; @Mock UserDao mockUserRepository; @Before public void setUp(){ MockitoAnnotations.initMocks(this); } @Test public void testFindUser(){ // Given User dummyUser = new User(); when(mockUserRepository.findByLoginAndPassword(anyString(), anyString()).thenReturn(dummyUser); // When User result = userService.findUser("first", "teste"); // Then // you are expecting service to return whatever returned by repo assertThat("result", result, is(sameInstance(dummUser))); // you are expecting repo to be called once with correct param verify(mockUserRepository).findByLoginAndPassword("first", "teste"); }}I'm using springMVC and I would like to test my services but my @Mock repository is not working, so I will never get my user because my repository is null, how can I fix this problem? am I doing something wrong in my annotations?Repository Interface:package br.com.api.model.data;import br.com.api.model.resources.User;import java.util.List;public interface UserDao { User findByLoginAndPassword(String login, String password); List<User> listAll();}Repository Implementation:package br.com.api.model.repository;import br.com.api.model.data.UserDao;import br.com.api.model.resources.User;import org.springframework.stereotype.Repository;import java.util.ArrayList;import java.util.List;@Repositorypublic class UserRepository implements UserDao { public User findByLoginAndPassword(String login, String password) { System.out.println("lets find:"); User userMatch = new User(); List<User> users = usersMockup(); for (User user : users) { if(user.getLogin().equals(login) && user.getPassword().equals(password)){ userMatch = user; } } return userMatch; } public List<User> listAll() { List<User> users = usersMockup(); return users; } private List<User> usersMockup(){ List<User> users = new ArrayList<User>(); User first = new User(); first.setLogin("first"); first.setPassword("teste"); User scnd = new User(); scnd.setLogin("second"); scnd.setPassword("teste"); users.add(first); users.add(scnd); return users; }}This is my Service:package br.com.api.model.services;import br.com.api.model.data.UserDao;import br.com.api.model.resources.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Servicepublic class UserService { @Autowired private UserDao userRepository; public User findUser(String login, String password) { User userMatch; userMatch = userRepository.findByLoginAndPassword(login, password); return userMatch; }}Here is my Test:package br.com.api.model.services;import br.com.api.model.repository.UserRepository;import br.com.api.model.resources.User;import org.junit.runner.RunWith;import org.mockito.MockitoAnnotations;import org.mockito.Mock;import org.junit.Before;import org.junit.Test;import org.mockito.InjectMocks;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import static org.mockito.Mockito.when;@RunWith(SpringJUnit4ClassRunner.class)public class UserServiceTest { @Mock UserDao userRepository; @InjectMocks UserService userService; @Before public void setUp(){ MockitoAnnotations.initMocks(this); } @Test public void findUser(){ User user; user = userService.findUser("first", "teste"); assertNotNull(user.getLogin()); }} 解决方案 I believe you missed the whole idea of unit testing and mocking.When you are unit testing your UserService, you DO NOT want to use the real UserRepository implementation.You mocked a UserRepository, you do not expect the mock object to immediately behave as the real one. You need to make up its behavior (aka stubbing).You should rarely need to use Spring Runner in unit test.In order to decide the behavior of the mock object, you gotta know the expected interaction of your system-under-test (SUT, which is the UserService in your case) and its dependencies (UserRepository)In your case, the test should looks like (haven't compiled, just show you the idea)public class UserServiceTest { @InjectMocks UserService userService; @Mock UserDao mockUserRepository; @Before public void setUp(){ MockitoAnnotations.initMocks(this); } @Test public void testFindUser(){ // Given User dummyUser = new User(); when(mockUserRepository.findByLoginAndPassword(anyString(), anyString()).thenReturn(dummyUser); // When User result = userService.findUser("first", "teste"); // Then // you are expecting service to return whatever returned by repo assertThat("result", result, is(sameInstance(dummUser))); // you are expecting repo to be called once with correct param verify(mockUserRepository).findByLoginAndPassword("first", "teste"); }} 这篇关于模拟的存储库返回null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！