testWidgets('builder can access GoRouter', (WidgetTester tester) async {
      late final GoRouter buildContextRouter;
      final GoRouter router = GoRouter(
        initialLocation: '/',
        routes: <GoRoute>[
          GoRoute(
            path: '/',
            builder: (BuildContext context, __) {
              buildContextRouter = GoRouter.of(context);
              return const DummyScreen();
            },
          )
        ],
      );

      await tester.pumpWidget(
        MaterialApp.router(
            routeInformationProvider: router.routeInformationProvider,
            routeInformationParser: router.routeInformationParser,
            routerDelegate: router.routerDelegate),
      );

      expect(buildContextRouter, isNotNull);
      expect(buildContextRouter, equals(router));
    });