The test games I do had not enough lines to make the scrollbars appear. The problem is, that some internal routines are a hack, and by doing things properly there might be side effects. (For instance, so far the focussing of elements, i.e. using buttons by keyboard was largely broken, and comboboxes were closed in many places just to be sure they close.)
I also highly doubt that automatied test of such things would be less complex than the actual code, and hence require tests of the tests ...