JUnit 4의 확장 모델은 @RunWith(Runner), TestRule, MethodRule.

JUnit 5의 확장 모델은 단 하나, Extension.

확장팩 등록 방법

• 선언적인 등록 @ExtendWith
• 프로그래밍 등록 @RegisterExtension
• 자동 등록 자바 ServiceLoader 이용

확장팩 만드는 방법

• 테스트 실행 조건
• 테스트 인스턴스 팩토리
• 테스트 인스턴스 후-처리기
• 테스트 매개변수 리졸버
• 테스트 라이프사이클 콜백
• 예외 처리
• ...

참고

• https://junit.org/junit5/docs/current/user-guide/#extensions

확장모델, 선언적인 등록 @ExtendWith

package com.example.testingweb.validatingforminput;

import org.junit.jupiter.api.extension.AfterTestExecutionCallback;
import org.junit.jupiter.api.extension.BeforeTestExecutionCallback;
import org.junit.jupiter.api.extension.ExtensionContext;

import java.lang.reflect.Method;

public class FindSlowTestExtension implements BeforeTestExecutionCallback, AfterTestExecutionCallback {

    private static final long THRESHOLD = 1000L;

    @Override
    public void beforeTestExecution(ExtensionContext context) throws Exception {
        ExtensionContext.Store store = getStore(context);
        store.put("START_TIME", System.currentTimeMillis());
    }

    @Override
    public void afterTestExecution(ExtensionContext context) throws Exception {
        Method requiredTestMethod = context.getRequiredTestMethod();
        SlowTest annotation = requiredTestMethod.getAnnotation(SlowTest.class);
        String testMethodName = context.getRequiredTestMethod().getName();
        ExtensionContext.Store store = getStore(context);
        long start_time = store.remove("START_TIME", long.class);
        long duration = System.currentTimeMillis() - start_time;
        if (duration > THRESHOLD && annotation == null) {
            System.out.printf("Please consider mark method [%s] with @SlowTest.\\n", testMethodName);
        }
    }

    private ExtensionContext.Store getStore(ExtensionContext context) {
        String testClassName = context.getRequiredTestClass().getName();
        String testMethodName = context.getRequiredTestMethod().getName();
        return context.getStore(ExtensionContext.Namespace.create(testClassName, testMethodName));
    }
}

package com.example.testingweb.validatingforminput;

import org.junit.jupiter.api.*;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.api.extension.Extensions;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.aggregator.AggregateWith;

import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
import static org.junit.jupiter.api.Assertions.assertEquals;

// @DisplayNameGeneration(DisplayNameGenerator.ReplaceUnderscores.class)
// @TestInstance(TestInstance.Lifecycle.PER_CLASS) // Study Instance를 한 개만 만듬.
@ExtendWith(FindSlowTestExtension.class) // 선언적 등록
@TestMethodOrder(MethodOrderer.OrderAnnotation.class) // OrderAnnotation을 가지고 순서를 정해준다.
class StudyTest {

void create_new_Study() {
    @SlowTest
    @DisplayName("스터디 만들기 slow")
    @Disabled
    void create1_new_study_again() {

    void create_new_study_again() throws InterruptedException {
        Thread.sleep(1005L);
        System.out.println(this);
        System.out.println("create1 " + value++);
    }

확장모델, @RegisterExtension

public class FindSlowTestExtension implements BeforeTestExecutionCallback, AfterTestExecutionCallback {

    private static final long THRESHOLD = 1000L;
    private long THRESHOLD;

    public FindSlowTestExtension(long THRESHOLD) {
        this.THRESHOLD = THRESHOLD;
    }

    @Override
    public void beforeTestExecution(ExtensionContext context) throws Exception {

@ExtendWith(FindSlowTestExtension.class) // 선언적 등록
@TestMethodOrder(MethodOrderer.OrderAnnotation.class) // OrderAnnotation을 가지고 순서를 정해준다.
class StudyTest {

    int value = 0;

    @RegisterExtension
    static FindSlowTestExtension findslowTestExtension = new FindSlowTestExtension(1000L);

    @Order(1)
    @SlowTest
    @Test
    @DisplayName("스터디 만들기 slow")
    @Disabled
    void create_new_study_again() throws InterruptedException {