Tests that the parameter to TextTrack.addCue() / removeCue() is not nullable.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS track.addCue(null) threw exception TypeError: Argument 1 ('cue') to TextTrack.addCue must be an instance of TextTrackCue.
PASS track.removeCue(null) threw exception TypeError: Argument 1 ('cue') to TextTrack.removeCue must be an instance of TextTrackCue.
PASS successfullyParsed is true

TEST COMPLETE