Repeated @ExtendWith in Kotlin & JUnit 5

Question

I'm using JUnit 5 in a Kotlin project and observing behavior that does not match the documentation. When using multiple @ExtendWith annotations on a test class I receive the following error:

Repeatable annotations with non-SOURCE retention are not yet supported

In the Extension section of the JUnit documentation this is listed as a valid option.
I'm using Kotlin 1.3.10 and JUnit 5.3.2

Why am I unable to repeat the @ExtendWith annotation on my test classes?

Answer 1

Repeatable annotations are not yet supported in Kotlin. You can, however, use the Extensions annotation:

@Extensions(
    ExtendWith(...),
    ExtendWith(...)
)