springboot @WebMvcTest测试controller报No qualifying bean of type 错误

spring boot版本1.4.0
JDK1.8
代码如下：

package com.qq.spring.boot.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

@Repository
public class BookDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;
    
    public Integer addBook(String name){
        String sql = "insert into books (bname)values('"+name+"')";
        return jdbcTemplate.update(sql);
    }
}

package com.qq.spring.boot.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.qq.spring.boot.dao.BookDao;

@RestController
public class BookController {

    @Autowired
    private BookDao bookDao;
    
    @GetMapping("/book/home")
    public String home(){
        System.out.println("xxxxxxxxxxxxxhomexxxxxxxxxx");
        bookDao.addBook("home");
        return "bookhome";
    }
}

test代码如下：

package com.qq.spring.boot.controller;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;

@RunWith(SpringRunner.class)
@WebMvcTest(controllers = BookController.class)
public class BookControllerTest2 {

     @Autowired
     private MockMvc mvc;
     
    @Test
    public void testHome() throws Exception {
        mvc.perform(MockMvcRequestBuilders.get("/book/home"))
        .andExpect(MockMvcResultMatchers.status().isOk()).andExpect(MockMvcResultMatchers.content().string("bookhome"));
    }
}

现在的问题是这样的，正常跑，可以访问/book/homeurl，没有问题
但是，跑junit test的时候，报错，
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.qq.spring.boot.dao.BookDao] found for dependency [com.qq.spring.boot.dao.BookDao]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

我的spring容器中，是有BookDao这个bean的，为啥还是报错？