Setting system properties when using junitPlatform

Question

I could not find out how to set system properties when executing JUnit 5 tests using Gradle. The standard test task could be configured as follows:

Answer 1

Update:

Please note that the junit-platform-gradle-plugin developed by the JUnit Team was deprecated in JUnit Platform 1.2 and discontinued in 1.3. Please switch to Gradle’s standard test task in Gradle 4.6 or higher. Details here.

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As I mentioned here, if you are still using the obsolete junit-platform-gradle-plugin you can set system properties like this:

afterEvaluate {
    def junitPlatformTestTask = tasks.getByName('junitPlatformTest')

    junitPlatformTestTask.systemProperty 'org.slf4j.simpleLogger.defaultLogLevel', 'warn'
}