springboot @WebMvcTest测试controller报No qu?报错

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";
	}
}

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 BookControllerTest {

	 @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/home url，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？