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08e22c4b64
While refactoring the backoff manager to simplify and unify the code in wait a race condition was encountered in TestSharedInformerWatchDisruption. The new implementation failed because the fake clock was not propagated to the backoff managers when the reflector was used in a controller. After ensuring the mangaers, reflector, controller, and informer shared the same clock the test needed was updated to avoid the race condition by advancing the fake clock and adding real sleeps to wait for asynchronous propagation of the various goroutines in the controller. Due to the deep structure of informers it is difficult to inject hooks to avoid having to perform sleeps. At a minimum the FakeClock interface should allow a caller to determine the number of waiting timers (to avoid the first sleep). Kubernetes-commit: 91b3a81fbd916713afe215f7d701950e13a02869