
PASS Test changeType with an empty type. 
PASS Test changeType after SourceBuffer removed from mediaSource. 
PASS Test changeType while update pending. 
PASS Test changeType with null type. 
PASS Test changeType with unsupported type. 
PASS Test changeType transitioning readyState from 'ended' to 'open'. 
PASS Test changeType sets mode to sequence for change to type that generates timestamps 
PASS Test changeType retains previous mode when changing to type that doesn't generate timestamps