This tests that visibleCharacterRange returns expected visible ranges.

Range of text-less div is empty: true
Got expected visible-character-range for window width 0px, height 500px, scrollTop 0px
Got expected visible-character-range for window width 500px, height 0px, scrollTop 0px
Got expected visible-character-range for window width 80px, height 80px, scrollTop 0px

PASS successfullyParsed is true

TEST COMPLETE