[UnitTest] Check for events that should not arrive

[wolframhaussig]

This issue is based on this discussion.

I want to create a test that checks that an event was NOT published. The usecase I try to replicate is that the publisher can be configured to temporarily ignore specific event types (e.g. because the target system is not available). So I am looking for something like this:

scenario.stimulate(() -> collector.poll())
            .andWaitAtMost(Duration.ofSeconds(5))
            .andWaitForEventOfType(NewJobEvent.class)
            .not().toArrive();
//or
scenario.stimulate(() -> collector.poll())
            .andWaitAtMost(Duration.ofSeconds(5))
            .andWaitForEventOfType(NewJobEvent.class)
            .notToArrive();