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How to test kotlin jvm? I can test Kotlin/Native v...
# multiplatform
a
How to test kotlin jvm? I can test Kotlin/Native very easily... But for K/JVM I get this ^
This is the report generated:
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org.gradle.api.internal.tasks.testing.TestSuiteExecutionException: Could not complete execution for Gradle Test Executor 3.
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:63)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy2.stop(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.stop(TestWorker.java:133)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
	at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.junit.platform.commons.util.PreconditionViolationException: Cannot create Launcher without at least one TestEngine; consider adding an engine implementation JAR to the classpath
	at org.junit.platform.commons.util.Preconditions.condition(Preconditions.java:285)
	at org.junit.platform.launcher.core.DefaultLauncher.<init>(DefaultLauncher.java:62)
	at org.junit.platform.launcher.core.LauncherFactory.create(LauncherFactory.java:91)
	at org.junit.platform.launcher.core.LauncherFactory.create(LauncherFactory.java:67)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.processAllTestClasses(JUnitPlatformTestClassProcessor.java:97)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor$CollectAllTestClassesExecutor.access$000(JUnitPlatformTestClassProcessor.java:79)
	at org.gradle.api.internal.tasks.testing.junitplatform.JUnitPlatformTestClassProcessor.stop(JUnitPlatformTestClassProcessor.java:75)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:61)
	... 25 more
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val commonTest by getting {
    dependsOn(commonMain)
    dependencies {
        implementation(kotlin("test-common"))
        implementation(kotlin("test-annotations-common"))
    }
}

val jvmTest by sourceSets.getting {
    dependsOn(jvmMain)
    dependsOn(commonTest)
    dependencies {
        implementation(kotlin("test-junit5"))
    }
}
The native setup was straight forward without platform dependency, but for jvm I even added junit 5 but still not able to run tests...
c
this is the error message from the stack trace:
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Cannot create Launcher without at least one TestEngine; consider adding an engine implementation JAR to the classpath
a
I did added.
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tasks.getByName<Test>("jvmTest") {
    useJUnitPlatform()
}
Is this not a testengine?
c
Copy code
testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.7.0")
thats the engine
add it as runtimeOnly to your jvmTest deps
junit5 is very confusing. what you added is a configuration for the junit5 platform. the platform needs engines
a
Woah that works!
I never had to do this in JVM only project iirc 🤔
Maybe kotest automatically did it, as I wasn't using the raw junit5 on its own 😅
c
probably had a transient dependency somewhere
👍 1
this is also a gradle usability bug. "Cannot create Launcher without at least one TestEngine; consider adding an engine implementation JAR to the classpath" should be in the error output and not somewhere hidden as cause in an exception stacktrace
😁 2
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