function
Flushes any pending microtasks and simulates the asynchronous passage of time for the timers in the fakeAsync zone by draining the macrotask queue until it is empty.
flush(maxTurns?: number): number maxTurns | number | The maximum number of times the scheduler attempts to clear its queue before throwing an error. Optional. Default is |
number: The simulated time elapsed, in milliseconds.
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https://angular.io/api/core/testing/flush