我从发球局得到的回答是空白的，我不知道为什么。我已经提供了迄今为止我所经历的一切。我正在学习一个教程，目标是通过比较我期望的字符串和实际的字符串来休息rest控制器。非常感谢你的帮助。
这是我的申请表

package com.books.gallo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@SpringBootApplication()
public class BooksRestApplication {

    public static void main(String[] args) {
        SpringApplication.run(BooksRestApplication.class, args);
    }

}

这是控制器

package com.books.gallo.resource.impl;

import java.util.Collection;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.books.gallo.domain.Book;
import com.books.gallo.resource.Resource;
import com.books.gallo.service.BookService;

@RestController
@RequestMapping("/books")
public class BookResourceImpl implements Resource<Book> {

    @Autowired
    private BookService bookService;

    @GetMapping("/testing")
    public String test(){
        return String.format("test has run");
    }

    @Override
    public ResponseEntity<Collection<Book>> findAll(){
        return new ResponseEntity<>(bookService.findAll(), HttpStatus.OK);

    }

    @Override
    public ResponseEntity<Book> findById(Long id){
        return new ResponseEntity<>(bookService.findById(id), HttpStatus.OK);

    }
    @Override
    public ResponseEntity<Book> save(Book book){
        return new ResponseEntity<>(bookService.save(book), HttpStatus.CREATED);

    }
    @Override
    public ResponseEntity<Book> update(Book book){
        return new ResponseEntity<>(bookService.update(book), HttpStatus.OK);

    }
    @Override
    public ResponseEntity<Book> deleteById(Long id){
        return new ResponseEntity<>(bookService.deleteById(id), HttpStatus.OK);

    }

}

这是我的测试

package com.books.gallo.resource.impl;

import com.books.gallo.service.impl.BookServiceImpl;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.RequestBuilder;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

import static org.junit.jupiter.api.Assertions.*;

@ExtendWith(SpringExtension.class)
@WebMvcTest(BookResourceImpl.class)
@ContextConfiguration(classes = {BookServiceImpl.class})
class IntegrationBookResourceImplTest {

    @Autowired
    private MockMvc mvc;

    @Test
    void test1() throws Exception {
        RequestBuilder request = MockMvcRequestBuilders.get("/books/testing");
        MvcResult result = mvc.perform(request).andReturn();
        assertEquals("test has run", result.getResponse().getContentAsString());
    }
}

This is the error

MockHttpServletRequest:
      HTTP Method = GET
      Request URI = /books/testing
       Parameters = {}
          Headers = []
             Body = null
    Session Attrs = {}

org.opentest4j.AssertionFailedError: 
Expected :test has run
Actual   :

Update after removal of @ContextConfiguration(classes = {BookServiceImpl.class})

[See Error Image below][1]

  [1]: https://i.stack.imgur.com/8pKR8.png