Can't use 'expect' in a 'catch' block of a testWidgets() body

[Hixie]

If runApp() throws synchronously, things end up such that you can't catch the exception and call expect() (because the whenComplete block in guard() hasn't run yet?).

[goderbauer]

/cc @chunhtai

[chunhtai]

@Hixie do you have a reproducible example?
This is the thing i tried

testWidgets('arguments for named routes on Navigator', (WidgetTester tester) async {
    GlobalKey currentRouteKey;
    final List<Object> arguments = <Object>[];

    await tester.pumpWidget(MaterialApp(
      onGenerateRoute: (RouteSettings settings) {
        arguments.add(settings.arguments);
        return MaterialPageRoute<void>(
          settings: settings,
          builder: (BuildContext context) => Center(key: currentRouteKey = GlobalKey(), child: Text(settings.name)),
        );
      },
    ));

    try{
      throw 'oh no';
    } catch (e) {
      print('in catch');
      expect(false, true);
    }
  });

it does throw expect error.

[goderbauer]

Closing since it doesn't seem to reproduce (see post above).