Run web API tests on CI and provide instructions for running locally

[koute]

Run web API tests on CI and provide instructions for running locally

[koute]

You just don't pass --nodejs and then cargo-web will try to run them in Chrome/Chromium. (You also need to temporairly comment out the #[cfg(...)] which prevents them from running, since I haven't yet implemented support for switching on features in cargo-web.)

Right now it's very hacky which is why it's not done on the CI. In the future I would certainly want to switch to headless Chrome or Firefox, then we can start running them on CI.

As to how hard would it be to support headless Chrome? Well, quite frankly I'm not sure. We'd have to implement the devtools protocol to communicate with it, and we'd have to get precompiled binaries for it from somewhere - probably build them ourselves just as we do for Emscripten (this alone is a huge pain since compiling Chrome takes ages, and the build system is a nightmare to set up).

[RangerMauve]

What about using an existing node.js headless chrome lib and creating WASM bindings for it's API?

[koute]

All of the tests are being run on CI and I've added instructions on how to run them at the end of the README, so closing.