unit-testing - 如何将 FakeAsync 与 testWidgets 一起使用？

Question

我正在尝试使用 Dart quiver 库中的 FakeAsync 来模拟 CountDownTimer 的时钟。但是，当我在 run 方法中等待任何异步函数时，它会挂起。

testWidgets('Resend OTP', (WidgetTester tester) async {
  await FakeAsync().run((async) async {
    final countDownTimer = new CountdownTimer(
      new Duration(seconds: 30),
      new Duration(seconds: 1),
      stopwatch: FakeStopwatch(
          () => async.getClock(DateTime.fromMillisecondsSinceEpoch(0)).now().millisecondsSinceEpoch, 1000),
    );
    print(countDownTimer.remaining);
    print(countDownTimer.isRunning);
    await tester.pumpWidget(Container());

  });
});

Answer 1

找到了，无论如何，我都会在这里发布它，以防将来有人需要答案:

testWidgets('Resend OTP Test concept', (WidgetTester tester) async {
    final fakeAsync = FakeAsync();
    fakeAsync.run((async) async {
      final countDownTimer = new CountdownTimer(
        new Duration(seconds: 30),
        new Duration(seconds: 1),
        stopwatch: FakeStopwatch(
            () => async.getClock(DateTime.fromMillisecondsSinceEpoch(0)).now().millisecondsSinceEpoch, 1000),
      );
      print(countDownTimer.remaining);
      print(countDownTimer.isRunning);
      await tester.pumpWidget(Container());
//      expect(true, false);

    });
    fakeAsync.flushMicrotasks();
  });

诀窍是为 FakeAsync 创建一个变量，然后同步调用 fakeAsync.flushMicrotasks();