spring-boot - 无法使用 spring boot gradle 插件执行依赖管理的 junit5 测试

Question

在我基于 gradle 和 kotlin 的项目中，我有一些子模块。为其模块构建配置(build.gradle.kts):

plugins {
    java
    kotlin("jvm")
    id("org.springframework.boot") version "2.1.5.RELEASE"
    id("io.spring.dependency-management") version "1.0.7.RELEASE"
}

dependencies {

    compile("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.31")
    compile("org.springframework.boot:spring-boot-starter-web")

    testCompile("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.31")
    testCompile("org.jetbrains.kotlin:kotlin-stdlib:1.3.31")
    testCompile("org.jetbrains.kotlin:kotlin-reflect:1.3.31")

    testImplementation("org.junit.jupiter:junit-jupiter-api:5.4.2")
    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.4.2")
}

我尝试在这个模块中运行一些简单的测试

简单类:

class Hello {
    fun hello(): String {
        return "hello"
    }
}

对其进行简单测试:

class HelloTest {
    @Test
    fun test() {
        Assertions.assertEquals(Hello().hello(), "hello")
    }
}

当我尝试运行测试时出现错误:

Jun 12, 2019 2:58:31 PM org.junit.platform.launcher.core.DefaultLauncher handleThrowable
WARNING: TestEngine with ID 'junit-jupiter' failed to execute tests
java.lang.NoSuchMethodError: org.junit.platform.commons.util.ReflectionUtils.tryToLoadClass(Ljava/lang/String;)Lorg/junit/platform/commons/function/Try;
    at org.junit.jupiter.engine.support.OpenTest4JAndJUnit4AwareThrowableCollector.createAbortedExecutionPredicate(OpenTest4JAndJUnit4AwareThrowableCollector.java:40)
    at org.junit.jupiter.engine.support.OpenTest4JAndJUnit4AwareThrowableCollector.<clinit>(OpenTest4JAndJUnit4AwareThrowableCollector.java:30)
    at org.junit.jupiter.engine.support.JupiterThrowableCollectorFactory.createThrowableCollector(JupiterThrowableCollectorFactory.java:34)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:68)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)
    at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188)
    at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
    at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:102)
    at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:82)
    at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:78)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
    at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
    at com.sun.proxy.$Proxy2.stop(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.stop(TestWorker.java:132)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:175)
    at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:157)
    at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:404)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:748)

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:rest:test'.
> No tests found for given includes: [ua.company.app.Hello](filter.includeTestsMatching)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 1s
4 actionable tasks: 2 executed, 2 up-to-date
No tests found for given includes: [ua.company.app.Hello](filter.includeTestsMatching)

但是如果从我的构建配置中删除 id("io.spring.dependency-management") version "1.0.7.RELEASE" 并且将像这样使用 spring boot 版本 compile ("org.springframework.boot:spring-boot-starter-web:2.1.5.RELEASE") 测试运行正确。

Spring 依赖管理破坏了我的 junit5 测试。请问谁能解释为什么会这样以及如何解决这个问题？谢谢!

Answer 1

添加 Spring 依赖管理似乎会更改 junit-jupiter 依赖项的一些传递依赖项。

您声明的 junit 版本 (5.4.2) 依赖于 junit-platform-commons 1.4.2，但是当您添加 Spring 依赖管理时，它会将公共(public)版本从 1.4.2 更改为 1.3.2。这就是您收到 NoSuchMethodError 的原因，因为该方法是在版本 4 中添加的!

这里有两个我能想到的解决方案:

1)(我推荐这个)删除你声明的 junit 版本，让 Spring 依赖管理处理 junit 的一切:

testImplementation("org.junit.jupiter:junit-jupiter-api")
testRuntime("org.junit.jupiter:junit-jupiter-engine")

2) 声明 junit 的传递依赖版本(如果这是必须的，这将允许您继续使用版本 5.4.2)

testImplementation("org.junit.jupiter:junit-jupiter-api:5.4.2")
testImplementation("org.junit.platform:junit-platform-commons:1.4.2")
testRuntime("org.junit.jupiter:junit-jupiter-engine:5.4.2")
testRuntime("org.junit.platform:junit-platform-engine:1.4.2")