import 'package:flutter_test/flutter_test.dart';

/// Mirrors DownloadQueue session drain gating used in `_pump`.
bool shouldNotifyQueueDrained({
  required bool sessionHadWork,
  required int queuedRemaining,
}) {
  return sessionHadWork && queuedRemaining == 0;
}

void main() {
  group('queue drained gating', () {
    test('does not fire when no work was processed', () {
      expect(
        shouldNotifyQueueDrained(sessionHadWork: false, queuedRemaining: 0),
        isFalse,
      );
    });

    test('fires when work ran and queue is empty', () {
      expect(
        shouldNotifyQueueDrained(sessionHadWork: true, queuedRemaining: 0),
        isTrue,
      );
    });

    test('does not fire while items remain', () {
      expect(
        shouldNotifyQueueDrained(sessionHadWork: true, queuedRemaining: 2),
        isFalse,
      );
    });
  });
}