JUnit 5 @AfterAll注解示例

JUnit 5 @AfterAll注记是JUnit 4中注解的替换。@AfterClass它用于表示应在当前测试类中的所有测试之后执行带注解的方法

@AfterAll注解用法

注解方法@AfterAll如下:

@AfterAll
public static void cleanUp(){
	System.out.println("After All cleanUp() method called");
}

@AfterAll带注解的方法必须是静态方法,否则将引发运行时错误。

org.junit.platform.commons.JUnitException: @AfterAll method 'public void com.how2codex.junit5.examples.JUnit5AnnotationsExample.cleanUp()' must be static.
	at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.assertStatic(LifecycleMethodUtils.java:66)
	at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.lambda$findAfterAllMethods$1(LifecycleMethodUtils.java:48)
	at java.util.ArrayList.forEach(ArrayList.java:1249)
	at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080)
	at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.findAfterAllMethods(LifecycleMethodUtils.java:48)

@AfterAll注解示例

让我们举个例子。我使用了一Calculator类并添加了一种add方法。我将使用@RepeatedTest注解对其进行5次测试。此注解将导致add测试运行5次。但是带@AfterAll注解的方法只能调用一次。

package com.how2codex.junit5.examples;

import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.RepetitionInfo;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInfo;
import org.junit.platform.runner.JUnitPlatform;
import org.junit.runner.RunWith;

@RunWith(JUnitPlatform.class)
public class AfterAnnotationsTest {

	@DisplayName("Add operation test")
	@RepeatedTest(5)
	void addNumber(TestInfo testInfo, RepetitionInfo repetitionInfo) 
	{
		System.out.println("Running test -> " + repetitionInfo.getCurrentRepetition());
		Assertions.assertEquals(2, Calculator.add(1, 1), "1 + 1 should equal 2");
	}
	
	@AfterAll
	public static void cleanUp(){
		System.out.println("After All cleanUp() method called");
	}
	
	@AfterEach
	public void cleanUpEach(){
		System.out.println("After Each cleanUpEach() method called");
	}
}

其中Calculator类是:

package com.how2codex.junit5.examples;

public class Calculator 
{
	public int add(int a, int b) {
		return a + b;
	}
}

现在执行测试,您将看到以下控制台输出:

Running test -> 1
After Each cleanUpEach() method called

Running test -> 2
After Each cleanUpEach() method called

Running test -> 3
After Each cleanUpEach() method called

Running test -> 4
After Each cleanUpEach() method called

Running test -> 5
After Each cleanUpEach() method called

After All cleanUp() method called

显然,带@AfterAll注解的cleanUp()方法仅被调用一次。

学习愉快!

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