flushTimers method

void flushTimers ({Duration timeout: const Duration(hours: 1), bool flushPeriodicTimers: true })

Runs all timers until no timers remain (subject to flushPeriodicTimers option), including those scheduled as a result of running them.

timeout lets you set the maximum amount of time the flushing will take. Throws a StateError if the timeout is exceeded. The default timeout is 1 hour. timeout is relative to the elapsed time.

Implementation 

void flushTimers(
    {Duration timeout: const Duration(hours: 1),
    bool flushPeriodicTimers: true});