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);
    }
    
    
}