Add integration tests

[heavyrubberslave]

Maybe setTimeout and setInterval calls should be wrapped and called via a factory so it’s easy to globally control whether they should be instantiated with unref() or not.

Had to add the unref() calls because else supertest could not shut down the app process and jest was complaining. Not sure if this behavior is also ok outside of the testing context as it will stop SlvCtrl+ from functioning if express‘ event loop stops…

Alternatively the factory could maybe be made stateful, knowing of all setInterval/setTimeout and reset them gracefully on express shutdown.

Alternatively express should fire an event on shutdown and the deviceproviders should receive this event and reset all devices to a 0 state before the process exits. 0 state in the sense that all values are set to 0/neutral and all device updaters and other intervals are cleared. (Probably the cleanest approach.)

// Create an express app
const app = express();

// Start listening on port 3000
const server = app.listen(3000, () => console.log('Server running on port 3000'));

// Listen to the 'close' event
server.on('close', () => {
  console.log('Server closed');
  // Close any other resources and set connected devices to 0/neutral state, close websocket connection for buttplugIo source, etc
});