junit4有关问题，求教

package com.spring.service;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.spring.model.User;import com.spring.service.UserService;public class UserServiceTest {    @Test    public void testAddUser(){        System.out.println("--test---");        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");        UserService us =(UserService)ctx.getBean("userService", UserService.class);                User u = new User();        u.setName("张三");        u.setAge(11);                us.addUser(u);    }        }