[RTCPeerConnection-setLocalDescription-answer.html]
  [setLocalDescription() with type answer and null sdp should use lastAnswer generated from createAnswer]
    expected: FAIL

  [setLocalDescription() with answer not created by own createAnswer() should reject with InvalidModificationError]
    expected: FAIL

  [Calling setLocalDescription(answer) from stable state should reject with InvalidStateError]
    expected: FAIL

  [Calling setLocalDescription(answer) from have-local-offer state should reject with InvalidStateError]
    expected: FAIL

