java - 无法从 intellij idea 运行 junit-5 测试用例

Question

Junit-5 测试用例从命令行成功运行。我正在使用 Maven，当我使用 mvn clean install 测试用例运行时成功运行，但是当使用 IntelliJ 运行单个测试用例时它失败并出现以下错误。

Feb 15, 2018 11:33:41 PM org.junit.jupiter.engine.discovery.JavaElementsResolver resolveMethod
WARNING: Method 'public static java.util.Collection com.softiventure.dtos.junit.parametrized.NestedParametrizedTest$sumTest.parameters()' could not be resolved.
Exception in thread "main" java.lang.NoSuchMethodError: org.junit.platform.launcher.Launcher.execute(Lorg/junit/platform/launcher/LauncherDiscoveryRequest;)V
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:59)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

我的示例测试类是:

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;

import static org.junit.jupiter.api.Assertions.assertNotNull;

@DisplayName("Pass paramters ")
public class ParametrizedJunit5Test {

    @DisplayName("Should pass a non-null message to our test method")
    @ParameterizedTest
    @ValueSource(strings = {"Hello", "World"})
    void shouldPassNonNullMessageAsMethodParameter(String message) {
        assertNotNull(message);
    }
}

如有任何帮助，我们将不胜感激。

Answer 1

JUnit5 和 IntelliJ 之间存在一些兼容性问题。

根据 the JUnit docs ...

it is recommended to use IDEA 2017.3 or newer since these newer versions of IDEA will download the following JARs automatically based on the API version used in the project: junit-platform-launcher, junit-jupiter-engine, and junit-vintage-engine.

这blog post来自 IntelliJ 团队也很重要。有一个 comment在遇到与您相同错误的用户的帖子中，该用户的回复是:

I update idea to 2017.2.6, it works well.

所以，更新到 IntelliJ 2017.3 或更新版本，这个问题应该会消失。