W3C Conformance Tests
It’s important that WebRTC works across browsers - Chrome must be able to talk to Firefox, for instance. The W3C conformance tests are strongly grounded in the spec and makes sure the browsers conform.
The WebRTC-related tests can be found at
Conformance Tests in Chrome
The conformance tests are pulled into Chrome continuous integration every now and then.
We actually have an automated test which tests Firefox nightly with Chrome continuously. The test brings up both browser and a local AppRTC server and makes sure they can get a call up and get video flowing.