JUnit 5 @BeforeEach 注释替代了 JUnit 4 中的 @Before
注释。
它用于表示应在当前类中的每个 @Test
方法之前执行带注释的方法。
@BeforeEach 注释用法
使用 @BeforeEach
注释一个方法,如下所示:
@BeforeEach public void initEach(){ System.out.println("Before Each initEach() method called"); }
@BeforeEach
注释方法不能是静态方法,否则会抛出运行时错误。
org.junit.platform.commons.JUnitException: @BeforeEach method 'public static void com.onitroad.junit5.examples.JUnit5AnnotationsExample.initEach()' must not be static. at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.assertNonStatic(LifecycleMethodUtils.java:73) at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.lambda$findBeforeEachMethods(LifecycleMethodUtils.java:54) at java.util.ArrayList.forEach(ArrayList.java:1249) at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080) at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.findBeforeEachMethods(LifecycleMethodUtils.java:54)
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@BeforeEach 注释示例
我使用了一个 Calculator
类并添加了一个 add
方法。
我将使用 @RepeatedTest
注释对其进行 5 次测试。
此注释将导致 add
测试运行 5 次。
对于每次运行测试方法,@BeforeEach
注释方法也应该每次运行。
package com.onitroad.junit5.examples; 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 BeforeEachTest { @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"); } @BeforeAll public static void init(){ System.out.println("BeforeAll init() method called"); } @BeforeEach public void initEach(){ System.out.println("BeforeEach initEach() method called"); } }
其中 Calculator 类是:
package com.onitroad.junit5.examples; public class Calculator { public int add(int a, int b) { return a + b; } }
现在执行测试,我们将看到以下控制台输出:
BeforeAll init() method called BeforeEach initEach() method called BeforeEach initEach() method called Running test -> 1 BeforeEach initEach() method called Running test -> 2 BeforeEach initEach() method called Running test -> 3 BeforeEach initEach() method called Running test -> 4 BeforeEach initEach() method called Running test -> 5
显然,@BeforeEach
注释的 initEach()
方法在每次测试方法调用时被调用一次。
日期:2020-09-17 00:09:52 来源:oir作者:oir