WithMockUser 어노테이션 추가시 인식이안됩니다.

WithMockUser 어노테이션 추가시  인식이안됩니다.

scope도 test로 지정했는데 왜그런지모르겟네요

cannot resolve Symbol이라는 메시지 뜨면서 

인식이 안됩니다.

소스첨부드리며 확인 부탁드립니다.

package me.izac.springbootsecurity;


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.security.test.context.support.WithMockUser;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;

@RunWith(SpringRunner.class)
@WebMvcTest(HomeController.class)
public class HomeControllerTest {

    @Autowired
    MockMvc mockMvc;

    @Test
    @WithMockUser
    public void hello() throws Exception {
        mockMvc.perform(get("/hello"))
                .andDo(print())
                .andExpect(status().isOk())
                .andExpect(view().name("hello"));
    }

    @Test
    public void hello_without_user() throws Exception {
        mockMvc.perform(get("/hello"))
                .andDo(print())
                .andExpect(status().isUnauthorized());
    }

    @Test
    @WithMockUser
    public void my() throws Exception {
        mockMvc.perform(get("/my"))
                .andDo(print())
                .andExpect(status().isOk())
                .andExpect(view().name("my"));
    }

}

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <version>${spring-security.version}</version>
        <scope>test</scope>
    </dependency>
</dependencies>