Do you think it would be worthwhile to encapsulate the multiselect_widget within the page object, so tests don't have to know about it? E.g., create a method in `MozTrapManageSuitesPage` called `included_cases` which then delegates to an embedded `multiselect_widget.included_items`?

This would add a bit of code to the page objects, but would make the tests a bit easier to understand and write, which is one of the reasons for having page objects. 

I'm interested to know what you think of that idea.