Kotlin 1.2.50 now provides a

org.jetbrains.kotlin:kotlin-test-junit5:1.2.50

dependency for JUnit 5.

could you elaborate what benefits does it bring?

It enables multi-platform testing by abstracting away the test framework annotations and assertions: http://kotlinlang.org/docs/reference/multiplatform.html#multiplatform-tests http://kotlinlang.org/api/latest/kotlin.test/index.html