Whether this command requires the widget tree to be initialized before the command may be run.
This defaults to true to force the application under test to call runApp before attempting to remotely drive the application. Subclasses may override this to return false if they allow invocation before the application has started.
- WidgetsBinding.isRootWidgetAttached, which indicates whether the widget tree has been initialized.
bool get requiresRootWidgetAttached => true;