org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-jupiter' failed to discover tests
org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-jupiter' failed to discover tests
我想在Gradle项目中实现一个Junit 5测试。我尝试了以下内容：
Gradle配置：
plugins {
id 'org.springframework.boot' version '2.5.5'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'test'
version = '0.0.1'
sourceCompatibility = '17'
repositories {
mavenCentral()
}
ext {
set('springCloudVersion', "2020.0.4")
}
dependencies {
...............
testImplementation 'org.springframework.boot:spring-boot-starter-test'
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
}
}
test {
useJUnitPlatform()
}
Junit测试：
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;
import java.util.concurrent.TimeUnit;
public class GeneratePdf {
@DisplayName("Test MessageService.get()")
@Test
@Timeout(value = 60, unit = TimeUnit.SECONDS)
public void generatePdfFileTes() throws InterruptedException
{
System.out.println("test!");
}
}
当我运行代码时，出现错误：
Internal Error occurred.
org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-jupiter' failed to discover tests
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:160)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverSafely(EngineDiscoveryOrchestrator.java:134)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discover(EngineDiscoveryOrchestrator.java:80)
at org.junit.platform.launcher.core.DefaultLauncher.discover(DefaultLauncher.java:110)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:86)
at org.junit.platform.launcher.core.DefaultLauncherSession$DelegatingLauncher.execute(DefaultLauncherSession.java:86)
at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:53)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: org.junit.platform.commons.JUnitException: MethodSelector [className = 'org.merchant.poc.GeneratePdf', methodName = 'generatePdfFileTes', methodParameterTypes = ''] resolution failed
at org.junit.platform.launcher.listeners.discovery.AbortOnFailureLauncherDiscoveryListener.selectorProcessed(AbortOnFailureLauncherDiscoveryListener.java:39)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:102)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:82)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:113)
at org.junit.jupiter.engine.discovery.DiscoverySelectorResolver.resolveSelectors(DiscoverySelectorResolver.java:46)
at org.junit.jupiter.engine.JupiterTestEngine.discover(JupiterTestEngine.java:69)
at org.junit.platform.launcher.core.EngineDiscoveryOrchestrator.discoverEngineRoot(EngineDiscoveryOrchestrator.java:152)
... 13 more
Caused by: org.junit.platform.commons.PreconditionViolationException: Could not load class with name: org.merchant.poc.GeneratePdf
at org.junit.platform.engine.discovery.MethodSelector.lambda$lazyLoadJavaClass$0(MethodSelector.java:157)
at org.junit.platform.commons.function.Try$Failure.getOrThrow(Try.java:335)
at org.junit.platform.engine.discovery.MethodSelector.lazyLoadJavaClass(MethodSelector.java:156)
at org.junit.platform.engine.discovery.MethodSelector.getJavaClass(MethodSelector.java:135)
at org.junit.jupiter.engine.discovery.MethodSelectorResolver.resolve(MethodSelectorResolver.java:73)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:146)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1602)
at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129)
at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:150)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:647)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:185)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:125)
at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:91)
... 18 more
Caused by: java.lang.ClassNotFoundException: org.merchant.poc.GeneratePdf
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at org.junit.platform.commons.util.ReflectionUtils.lambda$tryToLoadClass$9(ReflectionUtils.java:829)
at org.junit.platform.commons.function.Try.lambda$call$0(Try.java:57)
at org.junit.platform.commons.function.Try.of(Try.java:93)
at org.junit.platform.commons.function.Try.call(Try.java:57)
at org.junit.platform.commons.util.ReflectionUtils.tryToLoadClass(ReflectionUtils.java:792)
at org.junit.platform.commons.util.ReflectionUtils.tryToLoadClass(ReflectionUtils.java:748)
... 34 more
您知道如何解决这个问题吗？
编辑：
import org.junit.jupiter.api.Test;
public class InvoiceTests {
@Test
public void generateTest()
{
System.out.println("test!");
}
}
我尝试了这个，但还是不起作用。
原因：在将项目从JDK 11升级到JDK 17以及将junit-jupiter-api从5.7.0升级到5.8.2之后，出现了相同的问题。在该项目中，工作的版本是5.7.2。
解决方法：参考Github issue中的讨论。
代码示例：
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class MyTest {
@Test
public void test() {
assertEquals(2, 1 + 1);
}
}
问题的根源在于JUnit 5.8.0及更高版本的一个更改导致了这个问题。在JUnit 5.8.0之前，JUnit Jupiter引擎会自动加载和执行所有可见的测试类。但是在5.8.0及更高版本中，只有通过`@Test`注解明确标记为测试的类才会被加载和执行。
为了解决这个问题，可以采取以下两种解决方法之一：
1. 将JUnit Jupiter版本回退到5.7.2或更早的版本。在Maven项目中，可以在`pom.xml`文件中指定JUnit Jupiter的版本：
org.junit.jupiter junit-jupiter-api 5.7.2
2. 明确标记测试类和测试方法。在测试类和测试方法上添加`@Test`注解，以确保它们被加载和执行：
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
@Test
public class MyTest {
@Test
public void test() {
assertEquals(2, 1 + 1);
}
}
通过以上两种方法之一，可以解决这个问题并成功发现和执行测试。
org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-jupiter' failed to discover tests
这个问题的出现原因可能是项目的结构不符合要求，解决方法是按照以下结构进行项目的组织：
project-dir
-- src
-- main
-- java
-- classes
-- test
-- java
-- test-classes
另外，还要确保测试类的命名格式正确，可以参考以下答案中提到的命名规范：https://stackoverflow.com/a/70455369/10821123。
在升级JUnit版本从5.7.0到5.8.2时，我遇到了这个问题。尝试使用版本5.7.0的org.junit.jupiter:junit-jupiter-api和org.junit.jupiter:junit-jupiter-engine。同样的问题。我们知道5.8.2中的差异是什么导致了这个问题吗？谢谢，这对我很有帮助。这是我升级Spring Boot从2.5.10到2.6.5时的解决方案。是的，对我也有效，Eclipse版本为Version: 2022-03 (4.23.0) Build id: 20220310-1457，更改为5.7.0即可。谢谢！对我来说也适用于Intellij runner（Intellij Ultimate 2022.2.3）和Apache Ant 1.10.10。