How to know when the feathers-client is connected to a service - feathersjs

Question

I'm trying to test an event filter however there's a timing issue that I'm not sure how to resolve. Other than wrapping the REST request in a setTimeout, how could I get this working?
const app = require('../../src/app');
const feathers = require('feathers/client')
const socketio = require('feathers-socketio/client');
const hooks = require('feathers-hooks');
const io = require('socket.io-client');
const rp = require('request-promise');
const service = app.service('users');
let server = null;
describe('\'users\' service', () => {
beforeEach((done) => {
server = app.listen('3030');
server.once('listening', done);
});
afterEach((done) => {
server.close(done);
});
it('returns stuff #test', (done) => {
const socket = io('http://localhost:3030');
const app = feathers()
.configure(hooks())
.configure(socketio(socket));
const messageService = app.service('users');
messageService.on('created', message => {
console.log('Created a message', message);
done();
});
socket.on('connection', () => {
//
// The messageService is not connected yet
// so messages.filters.js will not fire
//
// Giving it a chance to connect with setTimeout does work...
// setTimeout(() => {
rp({
method: 'POST',
url: 'http://localhost:3030/users',
body: {
test: 'Message from REST'
},
json: true
});
// }, 500);
});
});
});
I have tried replacing the socket.on with these as well:
messageService.on('connection'
service.on('connection' (based on Node.js EventEmitter)
and so on...
Edit
I have since found service.on('newListener' works however it is being triggered many times. I need to track down the single connection:
const messageService = app.service('users');
messageService.on('created', message => {
console.log('Created a message', message);
done();
});

Answer 1

It's simply service.on('newListener'.
https://nodejs.org/api/events.html#events_event_newlistener
Listeners registered for the 'newListener' event will be passed the event name and a reference to the listener being added.
However, when I implemented this I found that it is listening to 5 different events. So, you need to filter those down:
service.on('newListener', (event, listener) => {
if (event === 'created') {
rp({
method: 'POST',
url: 'http://localhost:3030/users',
body: {
test: 'Message from REST'
},
json: true
});
}
});