runPkg function
When using Simulated, please use runPkg instead of runApp. This is to ensure that the viewPadding settings are applied correctly.
Implementation
void runPkg(Widget app) {
final _binding = _WidgetsFlutterBindingWithTestWindow.ensureInitialized();
_binding
..scheduleAttachRootWidget(app)
..scheduleWarmUpFrame();
}