I format my test 3 ways to convince my 8th graders that cheating is impossible---and to allow myself to differentiate (chunk tests) without making it obvious and calling the student out.
Test download includes:
3 differently formatted copies of the same test
-Version 1: Times New Roman, size 12 font
-Version 2: Times New Roman, size 16 font, 3 questions per page
-Version 2: Comic Sans, size 12 font