@xmpp/events/test/promise.test.js

XMPP events utilities.

"use strict";

const test = require("ava");
const { promise } = require("..");
const EventEmitter = require("events");

class Socket extends EventEmitter {
  constructor(fn) {
    super();
    this.fn = fn;
  }

  async connect() {
    if (!this.fn) return;
    await Promise.resolve();
    this.fn();
  }
}

test('resolves if "event" is emitted', async (t) => {
  const value = {};
  // eslint-disable-next-line func-names
  const socket = new Socket(function () {
    this.emit("connect", value);
  });
  t.is(socket.listenerCount("error"), 0);
  t.is(socket.listenerCount("connect"), 0);
  socket.connect();
  const p = promise(socket, "connect");
  t.is(socket.listenerCount("error"), 1);
  t.is(socket.listenerCount("connect"), 1);
  const result = await p;
  t.is(result, value);
  t.is(socket.listenerCount("error"), 0);
  t.is(socket.listenerCount("connect"), 0);
});

test('rejects if "errorEvent" is emitted', (t) => {
  const error = new Error("foobar");
  // eslint-disable-next-line func-names
  const socket = new Socket(function () {
    this.emit("error", error);
  });
  t.is(socket.listenerCount("error"), 0);
  t.is(socket.listenerCount("connect"), 0);
  socket.connect();
  const p = promise(socket, "connect", "error");
  t.is(socket.listenerCount("error"), 1);
  t.is(socket.listenerCount("connect"), 1);
  return p.catch((err) => {
    t.is(err, error);
    t.is(socket.listenerCount("error"), 0);
    t.is(socket.listenerCount("connect"), 0);
  });
});