SpringbootTest注入失败

正确方法：

/**
 * *@author:sawsh
 * *@date:2021/3/8
 * *@Description:
 **/
import com.sawsh.StartApplication;
import com.sawsh.entity.User;
import com.sawsh.mapper.UserDao;
import com.sawsh.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.context.web.WebAppConfiguration;

import java.util.List;

/**
 * *@author:sawsh
 * *@date:2021/3/5
 * *@Description:
 **/
//@SpringBootTest
@RunWith(SpringRunner.class)
@SpringBootTest(classes = StartApplication.class)
public class UserTest {
    @Autowired
    private UserDao userDao;
    @Autowired
    private UserService userService;

    @Test
    public void toTest(){
        List<User> userLogins = userDao.queryAll();
        userLogins.forEach(e-> System.out.println(e));
    }
}

　　

StartApplication是启动类