【JUnit5】TestEngine with ID 'junit-platform-suite' failed to discover tests

1. 結論

端的に言うとintellijで実行できていたテストコードを既に存在するEclipseプロジェクトに移植し、テストコードを実行すると発生したエラー。

結論、既存プロジェクトがEclipse内のJUnitライブラリを使用しており、自分で入れたJUnitのバージョンとあっておらず、依存関係が合わずエラーが出ていた模様。 Eclipse内のライブラリを依存関係から外すことで解決した。（画像1）

大規模プロジェクトで、プロジェクト同士が依存関係になっており、テストコードを使ってるプロジェクトが参照しているプロジェクトでEclipse内のJunitを参照していたので、気づかずに発見が遅れた。

画像１:Eclipse内のJunitライブラリ

2. 経緯

上述した通り、eclipseにテストコードやライブラリ含めて移動させたら、エラーが出た。エラー１
調べてみると、この類のエラーはどうやら、Junitの依存関係がおかしそうだ。参考情報
今まで使っていたJunitライブラリの組み合わせは安定に動いてたこともあり、おかしそうな点も見当たらない。
1. pom.xml の内容 _安定に動いてたはずのMaven依存関係
何がおかしいのかJunitについて深く調べていく
1. JUnitは、engineを依存関係に登録すると、platformと、apiが内包されていることがわかった
2. 依存関係をすべて解決してくれるAllInOne的な銀の弾丸的なリポジトリを発見する
  1. https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/
    
    このall in oneをもってしても、違うエラーが出る
    
    エラー２
さすがにおかしいと、Eclipseのほうの依存関係に焦点を絞り疑っていく
1. Eclipseに同梱されてるJunitがあることを発見(6)
2. 依存関係を洗いまくったら、JUnit5がいることを発見した
除去してテストコードを実行すると、エラー無く完了

3. 参考情報

3.1. エラー１

3 09, 2024 2:06:52 午後 org.junit.platform.launcher.core.DefaultLauncher handleThrowable
警告: TestEngine with ID 'junit-platform-suite' failed to discover tests
java.lang.NoSuchMethodError: org.junit.platform.engine.EngineDiscoveryRequest.getDiscoveryListener()Lorg/junit/platform/engine/EngineDiscoveryListener;
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:89)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:83)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113)
	at org.junit.platform.suite.engine.DiscoverySelectorResolver.resolveSelectors(DiscoverySelectorResolver.java:41)
	at org.junit.platform.suite.engine.SuiteTestEngine.discover(SuiteTestEngine.java:58)
	at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:130)
	at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:117)
	at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:82)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.<init>(JUnit5TestReference.java:42)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.createUnfilteredTest(JUnit5TestLoader.java:73)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.createTest(JUnit5TestLoader.java:63)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestLoader.loadTests(JUnit5TestLoader.java:50)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:522)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

3 09, 2024 2:06:52 午後 org.junit.platform.launcher.core.DefaultLauncher handleThrowable
警告: TestEngine with ID 'junit-platform-suite' failed to discover tests
java.lang.NoSuchMethodError: org.junit.platform.engine.EngineDiscoveryRequest.getDiscoveryListener()Lorg/junit/platform/engine/EngineDiscoveryListener;
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:89)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:83)
	at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113)
	at org.junit.platform.suite.engine.DiscoverySelectorResolver.resolveSelectors(DiscoverySelectorResolver.java:41)
	at org.junit.platform.suite.engine.SuiteTestEngine.discover(SuiteTestEngine.java:58)
	at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:130)
	at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:117)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

java.lang.NoSuchMethodError: org.junit.platform.launcher.TestPlan.getConfigurationParameters()Lorg/junit/platform/engine/ConfigurationParameters;
	at org.junit.platform.launcher.listeners.UniqueIdTrackingListener.testPlanExecutionStarted(UniqueIdTrackingListener.java:140)
	at org.junit.platform.launcher.core.TestExecutionListenerRegistry$CompositeTestExecutionListener.lambda$testPlanExecutionStarted$4(TestExecutionListenerRegistry.java:82)
	at java.util.ArrayList.forEach(ArrayList.java:1257)
	at org.junit.platform.launcher.core.TestExecutionListenerRegistry.notifyTestExecutionListeners(TestExecutionListenerRegistry.java:51)
	at org.junit.platform.launcher.core.TestExecutionListenerRegistry.access$100(TestExecutionListenerRegistry.java:27)
	at org.junit.platform.launcher.core.TestExecutionListenerRegistry$CompositeTestExecutionListener.testPlanExecutionStarted(TestExecutionListenerRegistry.java:82)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:149)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

3.2. エラー２

java.lang.NoSuchMethodError: org.junit.jupiter.api.extension.ExtensionContext.getTestInstances()Ljava/util/Optional;
	at base..BaseExtension.getTestClassInstance(BaseExtension.java:41)
	at base..BaseExtension.beforeTestExecution(BaseExtension.java:177)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$null$4(TestMethodTestDescriptor.java:138)
	at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeBeforeMethodsOrCallbacksUntilExceptionOccurs(TestMethodTestDescriptor.java:152)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeBeforeTestExecutionCallbacks(TestMethodTestDescriptor.java:137)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:108)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
	at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
	at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
	at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
	Suppressed: java.lang.NoSuchMethodError: org.junit.jupiter.api.extension.ExtensionContext.getTestInstances()Ljava/util/Optional;
		at base..BaseExtension.getTestClassInstance(BaseExtension.java:41)
		at base..BaseExtension.afterTestExecution(BaseExtension.java:201)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$null$7(TestMethodTestDescriptor.java:201)
		at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:226)
		at java.util.ArrayList.forEach(ArrayList.java:1257)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:224)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterTestExecutionCallbacks(TestMethodTestDescriptor.java:200)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:112)
		... 43 more

3.3. _安定に動いてたはずのMaven依存関係

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <junit.jupiter.version>5.9.1</junit.jupiter.version>
        <junit.platform.version>1.9.1</junit.platform.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>${junit.jupiter.version}</version>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>${junit.jupiter.version}</version>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-params</artifactId>
            <version>${junit.jupiter.version}</version>
        </dependency>
        <dependency>
            <groupId>org.junit.platform</groupId>
            <artifactId>junit-platform-suite</artifactId>
            <version>${junit.platform.version}</version>
        </dependency>

3.4. 参考文献

[spring boot - JUnit java.lang.NoSuchMethodError: org.junit.jupiter.api.extension.ExtensionContext.getRequiredTestInstances() - Stack Overflow](https://stackoverflow.com/questions/60471228/junit-java-lang-nosuchmethoderror-org-junit-jupiter-api-extension-extensioncont)
[JUnit 5 ユーザーガイド](https://junit.org/junit5/docs/current/user-guide/#running-tests-ide-eclipse)
[spring boot - JUnit java.lang.NoSuchMethodError: org.junit.jupiter.api.extension.ExtensionContext.getRequiredTestInstances() - Stack Overflow](https://stackoverflow.com/questions/60471228/junit-java-lang-nosuchmethoderror-org-junit-jupiter-api-extension-extensioncont)
[Maven Surefire プラグイン - JUnit 5プラットフォームの使用 (apache.org)](https://maven.apache.org/surefire/maven-surefire-plugin/examples/junit-platform.html)
[【SpringBoot】SpringBoot2.0.9 → 2.1.9でテストを実行できなくなった状況への対処【JUnit5】 #SpringBoot - Qiita](https://qiita.com/wrongwrong/items/9e2f89272329af73adba)
[JUnitがEclipseに同梱されるようになっていた件 - ts0818のブログ (hatenablog.com)](https://ts0818.hatenablog.com/entry/2023/03/12/113320)

raiki_dev’s blog

右も左も分かりませんが、よろしくお願いいたします。

【JUnit5】TestEngine with ID 'junit-platform-suite' failed to discover tests

【JUnit5】TestEngine with ID 'junit-platform-suite' failed to discover tests

1. 結論

2. 経緯

3. 参考情報

3.1. エラー１

3.2. エラー２

3.3. _安定に動いてたはずのMaven依存関係

3.4. 参考文献