在JUnit5之前，我们用@RunWith(MockitoJUnitRunner.class)注解，使用Mockito来做单元测试。使用JUnit5我们用@ExtendWith(MockitoExtension.class)注解，来做单元测试。这时我们同时使用@Mock/@InjectMocks/@Spy注解来配合写单元测试用例。
目前，可以说项目中都会使用Spring。那测试用例中怎么引入Spring呢？在JUnit5之前，我们可以使用@RunWith(SpringJUnit4ClassRunner.class)注解。而使用JUnit5我们用@ExtendWith(SpringExtension.class)注解，同时使用@MockBean来配合写单元测试用例。

@ExtendWith(MockitoExtension.class)

import static org.assertj.core.api.BDDAssertions.then;
import static org.mockito.BDDMockito.given;

import java.time.LocalDateTime;
import java.util.Arrays;
import java.util.List;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.security.core.userdetails.UserDetails;

import com.wanxun.recp.authorization.server.entity.TbPermission;
import com.wanxun.recp.authorization.server.entity.TbUser;
import com.wanxun.recp.authorization.server.service.ITbPermissionService;
import com.wanxun.recp.authorization.server.service.ITbUserService;
import com.wanxun.recp.authorization.server.service.impl.UserDetailsServiceImpl;

@ExtendWith(MockitoExtension.class)
public class UserDetailsServiceTest {

   @Mock
   private ITbUserService tbUserService;
   @Mock
   private ITbPermissionService tbPermissionService;
   
   @InjectMocks
   private UserDetailsServiceImpl userDetailsService;
   
   @BeforeEach
   public void setup() throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
       
   }
   @Test
   public void testLoadUser() {
       
       //given
       String username = "flynn";
       TbUser user = new TbUser();
       user.setCreated(LocalDateTime.now());
       user.setEmail("flynn@sina.com");
       user.setId(1L);
       user.setPassword("123456");
       user.setPhone("123456789");
       user.setUsername(username);
       
       List<TbPermission> tbPermissions = Arrays.asList(TbPermission.builder().created(user.getCreated()).id(user.getId()).name(username).build());
       //given
       given(tbUserService.getByUsername(username)).willReturn(user);
       given(tbPermissionService.selectByUserId(user.getId())).willReturn(tbPermissions);
//      BBDMockito.given().willReturn();
       
       //when
       UserDetails userDetails = userDetailsService.loadUserByUsername(username);
       
       //then
       then(userDetails.getUsername()).isEqualTo(user.getUsername());
       
   }
}

@ExtendWith(SpringExtension.class)

import static org.mockito.BDDMockito.given;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;

import java.time.LocalDateTime;
import java.util.Arrays;
import java.util.List;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.json.AutoConfigureJsonTesters;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.test.web.servlet.MockMvc;

import com.wanxun.recp.authorization.server.controller.TestController;
import com.wanxun.recp.authorization.server.entity.TbPermission;
import com.wanxun.recp.authorization.server.entity.TbUser;
import com.wanxun.recp.authorization.server.service.ITbPermissionService;
import com.wanxun.recp.authorization.server.service.ITbUserService;
import com.wanxun.recp.authorization.server.service.impl.UserDetailsServiceImpl;

@ExtendWith(SpringExtension.class)
@AutoConfigureJsonTesters
@WebMvcTest(TestController.class)
@TestPropertySource("classpath:/test.properties")
public class TestControllerTest {

    @MockBean
    private BCryptPasswordEncoder passwordEncoder;
    @MockBean
    private ITbUserService tbUserService;
    @MockBean
    private ITbPermissionService tbPermissionService;
    
    @Autowired
    private UserDetailsServiceImpl userDetailsService;
    
    @Autowired
    private MockMvc mvc;
    
    @Test
    public void testGetUserDetails() throws Exception {
        String username = "flynn";
        TbUser user = new TbUser();
        user.setCreated(LocalDateTime.now());
        user.setEmail("flynn@sina.com");
        user.setId(1L);
        user.setPassword("123456");
        user.setPhone("13702443392");
        user.setUsername(username);
        
        List<TbPermission> tbPermissions = Arrays.asList(TbPermission.builder().created(user.getCreated()).id(user.getId()).name(username).build());
        //given
        given(tbUserService.getByUsername(username)).willReturn(user);
        given(tbPermissionService.selectByUserId(user.getId())).willReturn(tbPermissions);
        
        
//       MockHttpServletResponse response = mvc.perform(
//                  post("/test/userDetails").contentType(MediaType.APPLICATION_JSON)
//                          .content(jsonRequestAttempt.write(attemptDTO).getJson()))
//                  .andReturn().getResponse();
         MockHttpServletResponse response = mvc.perform(
                 get("/test/userDetails").param("username", username)).andReturn().getResponse();
//               .andReturn().getResponse();
         System.out.println(response.getContentAsString());
         
    }
}