RxJava vs. Reactor
First of all, both versions of RxJava and Reactor are quite similar from a functional perspective. In Reactor, on the other hand, it’s enough to surround code under test and all underlying schedulers are auto-magically replaced with virtual ones:This particular test makes sure timeout works as expected. That was also the case for MongoDB, but they moved from RcJava driver to more general reactive streams driver that is compatible with both RxJava and Reactor.
Source: www.nurkiewicz.com