Tests MediaStreamTrack callbacks.

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


**** calling mediaDevices.getUserMedia() ****
PASS mediaDevices.getUserMedia succeeded.

**** setup video element ****
video.srcObject = mediaStream
Event 'loadedmetadata'
Event 'loadeddata'
Event 'canplay'

*** start playback ****
video.play()
Event 'canplaythrough'
Event 'play'
video.pause()

**** check states with live video stream track ****
PASS video.ended is false
PASS video.videoWidth is mediaStream.getVideoTracks()[0].getSettings().width
PASS video.videoHeight is mediaStream.getVideoTracks()[0].getSettings().height

PASS video.videoTracks.length is 1
PASS video.videoTracks.selectedIndex is 0
PASS video.videoTracks[0].id is mediaStream.getVideoTracks()[0].id
PASS video.videoTracks[0].selected is true
PASS mediaStream.getVideoTracks()[0].enabled is true

PASS mediaStream.getVideoTracks()[0].enabled is true
PASS mediaStream.getVideoTracks()[0].readyState is "live"

**** disable MediaStream video track ****
mediaStream.getVideoTracks()[0].enabled = false

**** re-check states now that the video stream has been disabled ****
PASS mediaStream.getVideoTracks()[0].enabled is false
PASS video.videoWidth is mediaStream.getVideoTracks()[0].getSettings().width
PASS video.videoHeight is mediaStream.getVideoTracks()[0].getSettings().height

**** stop MediaStream tracks ****
mediaStream.getVideoTracks()[0].enabled = true
mediaStream.getVideoTracks()[0].stop()
mediaStream.getAudioTracks()[0].stop()

Event 'ended'

**** re-check states now that the video stream has ended ****
PASS video.ended is true
PASS video.videoWidth is 0
PASS video.videoHeight is 0

PASS video.videoTracks.length is 1
PASS video.videoTracks.selectedIndex is -1
PASS video.videoTracks[0].selected is false

PASS mediaStream.getVideoTracks()[0].enabled is true
PASS mediaStream.getVideoTracks()[0].readyState is "ended"

PASS successfullyParsed is true

TEST COMPLETE