| PASS addTrack when pc is closed should throw InvalidStateError | |
| PASS addTrack with single track argument and no mediaStream should succeed | |
| PASS addTrack with single track argument and single mediaStream should succeed | |
| PASS addTrack with single track argument and multiple mediaStreams should succeed | |
| PASS Adding the same track multiple times should throw InvalidAccessError | |
| PASS addTrack with existing sender with null track, same kind, and recvonly direction should reuse sender | |
| PASS addTrack with existing sender with null track, same kind, and sendrecv direction should create new sender | |
| PASS addTrack with existing sender with null track, different kind, and recvonly direction should create new sender | |