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flush

function

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

Parameters
maxTurns number

The maximum number of times the scheduler attempts to clear its queue before throwing an error.

Optional. Default is undefined.
Returns

number: The simulated time elapsed, in milliseconds.

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https://v12.angular.io/api/core/testing/flush