颤振dependOnInheritedWidgetOfExactType在测试中失败

Question

应用可以正确运行flutter run

对于flutter drive --target=test_driver/main.dart，对dependentOnInheritedWidgetOfExactType的调用将返回null

一些相关代码：

class TimerServiceProvider extends InheritedWidget {
  const TimerServiceProvider({Key key, this.service, Widget child})
      : super(key: key, child: child);
  final TimerService service;
  @override
  bool updateShouldNotify(TimerServiceProvider old) => service != old.service;
}

在MyApp中，小部件树以TimerServiceProvider开头

final timerService = TimerService();

  @override
  Widget build(BuildContext context) {
    return TimerServiceProvider(
        // provide timer service to all widgets of your app
        service: timerService,
...

在其中一页上

timerService = TimerService.of(context);

在函数TimerService.of中，dependOnInheritedWidgetOfExactType返回null。在正常的应用执行过程中，此方法工作正常，如果从flutter driver运行，则返回null。

static TimerService of(BuildContext context) {
    var provider =
        context.dependOnInheritedWidgetOfExactType<TimerServiceProvider>();
    return provider.service;
  }

颤抖的医生

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.17.5, on Mac OS X 10.15.5 19F101, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.47.2)
[✓] Connected device (1 available)

• No issues found!