The following 4 test cases in the `webrtc/` directory test some of the mandatory-to-implement stats defined in WebRTC Statistics:

* `getstats.html`
* `RTCPeerConnection-getStats.https.html`
* `RTCPeerConnection-track-stats.https.html`
* `RTCRtpReceiver-getStats.https.html`
* `RTCRtpSender-getStats.https.html`
