flush

function

Simulates the asynchronous passage of time for the timers in the fakeAsync zone by draining the macrotask queue until it is empty.

maxTurns

number

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

Optional. Default is undefined.

number: The simulated time elapsed, in milliseconds.

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