
PASS Test addSourceBuffer(), removeSourceBuffer(), addSourceBuffer() sequence. 
PASS Test removeSourceBuffer() with null 
PASS Test calling removeSourceBuffer() twice with the same object. 
PASS Test calling removeSourceBuffer() for a sourceBuffer belonging to a different mediaSource instance. 
PASS Test calling removeSourceBuffer() in ended state. 
PASS Test removesourcebuffer event on activeSourceBuffers. 
PASS Test abort event when removeSourceBuffer() called while SourceBuffer is updating