Looking at the testing harness, the current version, even though it's alpha, seems to work with JUnit 5. This would be a huge improvement if we could start migrating to JUnit 5.

We should explore this. I did run the tests with 4.0.0-alpha-2 and they all worked with JUnit 4 as well.

There is also https://github.com/khmarbaise/maven-it-extension which allows JUnit 5 testing.

Another option to explore may be https://github.com/takari/takari-plugin-testing-project.