问Flutter集成测试:我无法瞄准我的一些小部件-找不到Getter

EN

integration_test/doctor_integration_test.dart:21:24: Error: Getter not found: 'SignInPage'.
    expect(find.byType(SignInPage), findsOneWidget);
                       ^^^^^^^^^^
                                                                        
                                                                        
FAILURE: Build failed with an exception.

MaterialApp _buildMaterialApp(BuildContext context) {
    return MaterialApp(
      title: 'Skinopathy: Doctor',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      routes: {
        '/': (context) {
          return BlocListener<AppBloc, AppState>(
            listener: (context, state) {
              if (state is AppAuthenticated) {
                Navigator.pushReplacement(
                  context,
                  MaterialPageRoute(
                    builder: (_) => WelcomePage(),
                  ),
                );
              } else if (state is AppUnauthenticated) {
                Navigator.pushReplacementNamed(context, '/sign_in');
              } else if (state is AppOutdated) {
                Navigator.pushReplacement(
                  context,
                  MaterialPageRoute(
                    builder: (_) => OutdatedVersionPage(),
                  ),
                );
              }
            },
            child: Center(
              child: SplashPage(),
            ),
          );
        },
        '/sign_in': (context) {
          return SignInPage();
        },