dispose method

@override void dispose()

Says DeviceLossReason.destroyed on lost the first time, as every backend owes for its own dispose, and closes lost and errors.

Implementation

@override
void dispose() {
  if (!_isDisposed) {
    _isLost = true;
    _lost.add(
      const DeviceLoss(
        reason: DeviceLossReason.destroyed,
        message: 'the fake device was disposed',
      ),
    );
  }
  _isDisposed = true;
  _live.clear();
  unawaited(_lost.close());
  unawaited(_errors.close());
}