
PASS Test initial value of SourceBuffer.mode is "segments" 
PASS Test setting SourceBuffer.mode 
PASS Test setting a removed SourceBuffer's mode 
PASS Test setting SourceBuffer.mode while still updating 
PASS Test setting SourceBuffer.mode triggers parent MediaSource 'ended' to 'open' transition. 
FAIL Test setting SourceBuffer.mode and SourceBuffer.timestampOffset while parsing media segment. assert_throws: Setting valid sourceBuffer.mode while still parsing media segment threw InvalidStateError. function "function () { sourceBuffer.mode = 'segments'; }" did not throw