2 PASS Demuxed content with different lengths
3 PASS Process first init segment for sourceBuffer[0] first
4 PASS Process first init segment for sourceBuffer[1] first
5 PASS Muxed tracks with different lengths
6 PASS Demuxed content with an empty buffered range on one SourceBuffer
7 PASS Muxed content empty buffered ranges.
8 PASS Get buffered range when sourcebuffer is empty.
9 PASS Get buffered range when only initsegment is appended.
10 PASS Get buffered range after removing sourcebuffer.