 
PASS TextTrack.addCue(), adding a cue to two different tracks 
PASS TextTrack.addCue(), adding a cue to a track twice 
PASS TextTrack.addCue(), adding a removed cue to a different track 
PASS TextTrack.addCue(), adding an associated but removed cue to the same track 
PASS TextTrack.addCue(), adding a cue associated with a track element to other track 

