The “tune test” is taken in the semester preceding the Senior Recital, during the end-of-semester area jury. (This is an added component—it does not replace the usual end-of-semester jury.) See the UVM List of Required Jazz Tunes (PDF).
Rhythm section players - The student creates a list with the private teacher that includes at least 20 tunes; faculty choose one piece from this list and the student plays that piece from memory (performing the melody, taking a solo, and comping).
All other musicians - Faculty pick three tunes from the appropriate lists and the auditionee must perform one of those three.
The student will play the melody and improvise a chorus from memory while keeping the form and chord changes. Rhythm section players must also play a chorus of comping or bass accompaniment (e.g., walking or appropriate style). Vocalists must know the lyrics from memory.