The JUnit reference should probably be to ErrorCollector rather than Verifier, since that's what you'd actually use.

ErrorCollector isn't in JUnit 5, and i believe the maintainers think that Assertions::assertAll is a sufficient replacement, which it isn't. I wrote an ErrorCollector for JUnit 5:

https://gist.github.com/tomwhoiscontrary/4fbf20350700d7e1c35...

But i'm sure someone could do a better job of it.