关于单元测试的controller的调用

我的分页的controller
package controller;
import bean.Client;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;import service.ClientService;
import java.util.List;@Controller
public class ClientController {
    @Autowired
    ClientService clientService;
    @RequestMapping("/clis")
    public String getClis(@RequestParam(value="pn",defaultValue = "1")Integer pn, Model model){
        PageHelper.startPage(pn,5);        List<Client> clis=clientService.getAll();
        PageInfo page=new PageInfo(clis,5);
        model.addAttribute("pageInfo",page);
        return "list";
    }
}单元测试package test;import java.util.List;import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;import bean.Client;
import com.github.pagehelper.PageInfo;@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextConfiguration(locations ={"classpath:applicationContext.xml","file:E:\\test\\MacenDemo\\src\\main\\webapp\\WEB-INF\\dispatcherServlet-servlet.xml"})
public class MvcTest {
    @Autowired
    WebApplicationContext context;
    MockMvc mockMvc;
    @Before
    public void initMockMvc(){        mockMvc=MockMvcBuilders.webAppContextSetup(context).build();
    }
    @Test
    public void testPage() throws Exception{
        MvcResult result= mockMvc.perform(MockMvcRequestBuilders.get("/clis").param("pn","5")).andReturn();
        MockHttpServletRequest request=result.getRequest();
        PageInfo pi= (PageInfo) request.getAttribute("pageInfo");
        System.out.println("当前页码："+ pi.getPageNum());
        System.out.println("总页码："+ pi.getPages());
        System.out.println("总记录数："+ pi.getTotal());
        System.out.println("在页面需要连续显示的页码");
        int[] nums=pi.getNavigatepageNums();
        for(int i:nums){
            System.out.println(" "+i);
        }
        List<Client> list=pi.getList();
        for(Client client:list){
            System.out.println("ID:"+client.getId()+"==>Name"+client.getClientname());
        }
    }
}异常代码java.lang.NullPointerException
at test.MvcTest.testPage(MvcTest.java:39)
也就是没有取到pi的值，pi为空
ClientController 显示Class 'ClientController' is never used求大神指导，已经研究两天了，谢谢你们了