JUnit5 `@RepeatedTest`注解示例

原文： https://howtodoinjava.com/junit5/repeated-test-annotation-example/

通过 JUnit5 @RepeatedTest注解，可以编写可以多次运行的可重复测试模板。 频率可以配置为@RepeatedTest注解的参数。

1. @RepeatedTest注解用法

要创建可重复的测试模板方法，请使用@RepeatedTest注解该方法。

@DisplayName("Add operation test")
@RepeatedTest(5)
void addNumber(TestInfo testInfo) {
    Calculator calculator = new Calculator();
    Assertions.assertEquals(2, calculator.add(1, 1), "1 + 1 should equal 2");
}

在上面的代码中，addNumber()测试将重复 5 次。

请注意，每次重复测试的行为都类似于常规@Test方法的执行，并且完全支持相同的生命周期回调和扩展。 这意味着对于每个单独的调用，将在适合它们的测试生命周期的地方调用@BeforeEach和@AfterEach带注解的方法。

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

上面程序的输出：

Before All init() method called
Before Each initEach() method called
After Each cleanUpEach() method called
Before Each initEach() method called
Running addNumber test -> 1
After Each cleanUpEach() method called
Before Each initEach() method called
Running addNumber test -> 2
After Each cleanUpEach() method called
Before Each initEach() method called
Running addNumber test -> 3
After Each cleanUpEach() method called
Before Each initEach() method called
Running addNumber test -> 4
After Each cleanUpEach() method called
Before Each initEach() method called
Running addNumber test -> 5
After Each cleanUpEach() method called
After All cleanUp() method called

2. 自定义显示测试名称

除了指定重复次数之外，您还可以为每个重复指定自定义显示名称。 此自定义显示名称可以是静态文本+动态占位符的组合。 当前，支持 3 个占位符：

• {displayName}：@RepeatedTest方法的显示名称。
• {currentRepetition}：当前重复计数。
• {totalRepetitions}：重复总数。

@RunWith(JUnitPlatform.class)
public class JUnit5AnnotationsExample 
{
    @DisplayName("Add operation test")
    @RepeatedTest(value = 5, name = "{displayName} - repetition {currentRepetition} of {totalRepetitions}")
    void addNumber(TestInfo testInfo) {
        Assertions.assertEquals(2, Calculator.add(1, 1), "1 + 1 should equal 2");
    }
}

运行以上测试将在下面输出：

JUnit5 重复测试的显示名称

您可以使用两种预定义格式之一，即RepeatedTest.LONG_DISPLAY_NAME和RepeatedTest.SHORT_DISPLAY_NAME。 如果未指定，则SHORT_DISPLAY_NAME是默认格式。

• RepeatedTest.LONG_DISPLAY_NAME – {displayName} :: repetition {currentRepetition} of {totalRepetitions}
• RepeatedTest.SHORT_DISPLAY_NAME – repetition {currentRepetition} of {totalRepetitions}

@DisplayName("Add operation test")
@RepeatedTest(value = 5, name = RepeatedTest.LONG_DISPLAY_NAME)
void addNumber(TestInfo testInfo) {
    Assertions.assertEquals(2, Calculator .add(1, 1), "1 + 1 should equal 2");
}

3. RepetitionInfo接口

RepetitionInfo用于将有关重复测试的当前重复的信息注入@RepeatedTest，@BeforeEach和@AfterEach方法中。

@RunWith(JUnitPlatform.class)
public class JUnit5AnnotationsExample {
    @BeforeEach
    public void initEach(RepetitionInfo info){
        int currentRepetition = info.getCurrentRepetition();
        int totalRepetitions = info.getTotalRepetitions();
        //Use information as needed
    }
    @DisplayName("Add operation test")
    @RepeatedTest(value = 5, name="{displayName} :: repetition {currentRepetition} of {totalRepetitions}")
    void addNumber(TestInfo testInfo) {
        Calculator calculator = new Calculator();
        Assertions.assertEquals(2, calculator.add(1, 1), "1 + 1 should equal 2");
    }
    @AfterEach
    public void cleanUpEach(RepetitionInfo info){
        int currentRepetition = info.getCurrentRepetition();
        int totalRepetitions = info.getTotalRepetitions();
        //Use information as needed
    }
}

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