vetController 부분에서 오류가 납니다. - 처음 Maven 실행 부분 입니다.

[INFO] 
[INFO] Results:
[INFO] 
[ERROR] Failures: 
[ERROR]   VetControllerTests.testShowResourcesVetList:75 Status expected:<200> but was:<406>
[ERROR] Errors: 
[ERROR]   PetclinicIntegrationTests.testFindAll » IllegalState Failed to load Applicatio...
[INFO] 
[ERROR] Tests run: 40, Failures: 1, Errors: 1, Skipped: 1
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  21.446 s
[INFO] Finished at: 2020-12-10T00:09:20+09:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test (default-test) on project spring-petclinic: There are test failures.
[ERROR] 
[ERROR] Please refer to /Users/username/IdeaProjects/spring-petclinic/target/surefire-reports for the individual test results.
[ERROR] Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

안녕하세요 선생님, 

git 으로부터 소스코드 다운받고, 1.8 버전의 jdk 로 했습니다. 

그런다음에 maven 
--> mvnw package

의 명령어를 터미널 켜서 쳤는데, 이러한 오류가 발생했습니다. 

제가 스프링 코드를 아예 볼 줄 몰라서 구글링을 해 봤는데.. 

찾은 코드를 어디에 넣어야 할지 몰라서 이렇게 질문 남기게 되었습니다. 

위는 오류 메세지 입니다. 

혹시 몰라서 VetController 코드도 올려 보겠습니다. 

package org.springframework.samples.petclinic.vet;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Map;

/**
 * @author Juergen Hoeller
 * @author Mark Fisher
 * @author Ken Krebs
 * @author Arjen Poutsma
 */
@Controller
class VetController {

	private final VetRepository vets;

	public VetController(VetRepository clinicService) {
		this.vets = clinicService;
	}

	@GetMapping("/vets.html")
	public String showVetList(Map<String, Object> model) {
		// Here we are returning an object of type 'Vets' rather than a collection of Vet
		// objects so it is simpler for Object-Xml mapping
		Vets vets = new Vets();
		vets.getVetList().addAll(this.vets.findAll());
		model.put("vets", vets);
		return "vets/vetList";
	}

	@GetMapping({ "/vets" })
	public @ResponseBody Vets showResourcesVetList() {
		// Here we are returning an object of type 'Vets' rather than a collection of Vet
		// objects so it is simpler for JSon/Object mapping
		Vets vets = new Vets();
		vets.getVetList().addAll(this.vets.findAll());
		return vets;
	}

}