JUnit5 `@AfterEach`注解示例

@AfterEach注解用法
@AfterEach注解示例

原文： https://howtodoinjava.com/junit5/after-each-annotation-example/

JUnit5 @AfterEach 注解替换了 JUnit4 中的@After注解。它用于表示应在当前类中的每个@Test方法之后执行注解方法。

`@AfterEach`注解用法

使用@AfterEach注解方法，如下所示：

@AfterEach
public void cleanUpEach(){
    System.out.println("After Each cleanUpEach() method called");
}

带注解的@AfterEach方法不得为静态方法，否则它将引发运行时错误。

org.junit.platform.commons.JUnitException: @AfterEach method 'public static void com.howtodoinjava.junit5.examples.JUnit5AnnotationsExample.cleanUpEach()' must not be static.
    at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.assertNonStatic(LifecycleMethodUtils.java:73)
    at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.lambda$findAfterEachMethods$3(LifecycleMethodUtils.java:60)
    at java.util.ArrayList.forEach(ArrayList.java:1249)
    at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080)
    at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.findAfterEachMethods(LifecycleMethodUtils.java:60)

`@AfterEach`注解示例

让我们举个例子。我使用了一个Calculator类并添加了一个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。对于每次运行的测试方法，@AfterEach带注解的方法也应每次运行。

package com.howtodoinjava.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.howtodoinjava.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，每次测试方法调用时都将调用@AfterEach注解的cleanUpEach()方法。

学习愉快！

源码下载

@AfterEach注解用法

@AfterEach注解示例

`@AfterEach`注解用法

`@AfterEach`注解示例