
PASS Parameterless SLD() in 'stable' goes to 'have-local-offer'
PASS Parameterless SLD() in 'stable' sets pendingLocalDescription
PASS Parameterless SLD() in 'stable' assigns transceiver.mid
PASS Parameterless SLD() in 'have-remote-offer' goes to 'stable'
PASS Parameterless SLD() in 'have-remote-offer' sets currentLocalDescription
PASS Parameterless SLD() in 'have-remote-offer' sets transceiver.currentDirection
PASS Parameterless SLD() uses [[LastCreatedOffer]] if it is still valid
PASS Parameterless SLD() uses [[LastCreatedAnswer]] if it is still valid
PASS Parameterless SLD() rejects with InvalidStateError if already closed
PASS Parameterless SLD() never settles if closed while pending
PASS Parameterless SLD() in a full O/A exchange succeeds
PASS Parameterless SRD() rejects with TypeError.
PASS RTCSessionDescription constructed without type throws TypeError