Wait for file events to propagated for slower Listen backends. #26829
The tests for filesystem events ("checker" or "listen") do not wait for the
On JRuby, the
Listen, when used on JRuby, does have have access to synchronous filesystem events. Instead, it uses a listen loop which has some delay in registering filesystem changes. These tests checked for events to have fired immediately after making filesystem changes, which did not allow time for that listen loop to trigger. I added `wait` to each test, as a few already did, to ensure the events fire. With these changes, the tests are all green on JRuby.
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