Video should be running, go to black and running.
Following, should be a snapshot of the video, a black frame and a snapshot of the video.
  

PASS Verify VP8 activation 
PASS Setting video exchange 
PASS Ensuring connection state is connected 
PASS Track is enabled, video should not be black 
PASS Track is disabled, video should be black 
PASS If disabled, black frames should still be coming 
PASS Track is enabled, video should not be black 2