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Cannot create Launcher without at least one TestEngine; consider adding an engine implementation JAR to the classpath



Asked on May 10, 2021
I have a Gradle file as below, I just want to run my JUnit test classes.

build.gradle

plugins {
    id 'application'
}
repositories {
    mavenCentral()
}
tasks.named('test') {
    useJUnitPlatform()
}
dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.1'
}

When I run gradle clean test , it throws error.

Caused by: org.junit.platform.commons.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:296)
at org.junit.platform.launcher.core.DefaultLauncher.<init>(DefaultLauncher.java:48)
at org.junit.platform.launcher.core.LauncherFactory.create(LauncherFactory.java:105)
at org.junit.platform.launcher.core.LauncherFactory.create(LauncherFactory.java:75)
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)



Replied on May 10, 2021
You need to add junit-jupiter-engine test dependency.

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.1'
    testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.7.1'
}


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