FlutterのWidgetテストで画面遷移をするときのSetup

setup_screen_transitions.dart

late Widget testWidget;
final appRouter = AppRouter();

// 読み込み時に実行
setUp(() {
  testWidget = ProviderScope(
    child: MediaQuery(
      data: MediaQueryData(),
      child: ScreenUtilInit(
        designSize: const Size(375, 812),
        minTextAdapt: true,
        builder: (context, child) {
          return MaterialApp.router(
            builder: (context, child) {
              return Scaffold(
                body: child,
              );
            },
            routerDelegate: appRouter.delegate(
              initialRoutes: [const ApplyStepFirstRoute()],
            ),
            routeInformationParser: appRouter.defaultRouteParser(),
          );
        },
      ),
    ),
  );
});