waitFor<T> function Null safety

Future<T?> waitFor<T>(
  1. FutureOr<T> condition(
      ),
    1. {dynamic matcher,
    2. Duration timeout = defaultTimeout,
    3. Duration interval = defaultInterval}
    )

    Implementation

    Future<T?> waitFor<T>(FutureOr<T> Function() condition,
        {matcher,
        Duration timeout = defaultTimeout,
        Duration interval = defaultInterval}) =>
    clock.waitFor<T>(condition,
        matcher: matcher, timeout: timeout, interval: interval);