I think indeed all tests are using JUnit 3 but I suspect when you opened it that we meant to convert the style to JUnit4, i.e. to make sure we rely on @Test rather than method name test prefix

I'm not sure if it is a problem in practice? I descheduled it from 5 as it's definitely not staying in the way for a release, but I'm also open to close it as outdated and leave it to normal ongoing refactoring to eventually transform all tests.