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test.js
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/* istanbul ignore next */
describe('Ultron', function () {
'use strict';
var EventEmitter = require('eventemitter3')
, assume = require('assume')
, EE = require('events')
, Ultron = require('./')
, ultron
, ee;
beforeEach(function () {
ee = new EventEmitter();
ultron = new Ultron(ee);
});
afterEach(function () {
ultron.destroy();
ee.removeAllListeners();
});
it('is exposed as a function', function () {
assume(Ultron).is.a('function');
});
it('can be initialized without the new keyword', function () {
assume(Ultron(ee)).is.instanceOf(Ultron);
});
it('assigns a unique id to every instance', function () {
for (var i = 0; i < 100; i++) {
assume(ultron.id).does.not.equal((new Ultron()).id);
}
});
it('allows removal through the event emitter', function () {
function foo() {}
function bar() {}
ultron.on('foo', foo);
ultron.once('foo', bar);
assume(foo.__ultron).equals(ultron.id);
assume(bar.__ultron).equals(ultron.id);
assume(ee.listeners('foo').length).equals(2);
ee.removeListener('foo', foo);
assume(ee.listeners('foo').length).equals(1);
ee.removeListener('foo', bar);
assume(ee.listeners('foo').length).equals(0);
});
describe('#on', function () {
it('assigns a listener', function () {
assume(ee.listeners('foo').length).equals(0);
function foo() {}
ultron.on('foo', foo);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('foo')[0]).equals(foo);
});
it('tags the assigned function', function () {
assume(ee.listeners('foo').length).equals(0);
ultron.on('foo', function () {});
assume(ee.listeners('foo')[0].__ultron).equals(ultron.id);
});
it('also passes in the context', function (next) {
var context = 1313;
ultron.on('foo', function (a, b, c) {
assume(a).equals('a');
assume(b).equals('b');
assume(c).equals('c');
assume(this).equals(context);
next();
}, context);
ee.emit('foo', 'a', 'b', 'c');
});
it('works with regular eventemitters as well', function (next) {
var ee = new EE()
, ultron = new Ultron(ee);
ultron.on('foo', function (a, b, c) {
assume(a).equals('a');
assume(b).equals('b');
assume(c).equals('c');
next();
});
ee.emit('foo', 'a', 'b', 'c');
});
});
describe('#once', function () {
it('assigns a listener', function () {
assume(ee.listeners('foo').length).equals(0);
function foo() {}
ultron.once('foo', foo);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('foo')[0]).equals(foo);
});
it('tags the assigned function', function () {
assume(ee.listeners('foo').length).equals(0);
ultron.once('foo', function () {});
assume(ee.listeners('foo')[0].__ultron).equals(ultron.id);
});
it('also passes in the context', function (next) {
var context = 1313;
ultron.once('foo', function (a, b, c) {
assume(a).equals('a');
assume(b).equals('b');
assume(c).equals('c');
assume(this).equals(context);
next();
}, context);
ee.emit('foo', 'a', 'b', 'c');
ee.emit('foo', 'a', 'b', 'c'); // Ensure that we don't double execute
});
it('works with regular eventemitters as well', function (next) {
var ee = new EE()
, ultron = new Ultron(ee);
ultron.once('foo', function (a, b, c) {
assume(a).equals('a');
assume(b).equals('b');
assume(c).equals('c');
next();
});
ee.emit('foo', 'a', 'b', 'c');
ee.emit('foo', 'a', 'b', 'c'); // Ensure that we don't double execute
});
});
describe('#remove', function () {
it('removes only our assigned `on` listeners', function () {
function foo() {}
function bar() {}
ee.on('foo', foo);
ultron.on('foo', bar);
assume(ee.listeners('foo').length).equals(2);
ultron.remove('foo');
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('foo')[0]).equals(foo);
});
it('removes only our assigned `once` listeners', function () {
function foo() {}
function bar() {}
ee.once('foo', foo);
ultron.once('foo', bar);
assume(ee.listeners('foo').length).equals(2);
ultron.remove('foo');
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('foo')[0]).equals(foo);
ee.removeAllListeners();
ultron.destroy();
ee = new EE();
ultron = new Ultron(ee);
ee.once('foo', foo);
ultron.once('foo', bar);
assume(ee.listeners('foo').length).equals(2);
ultron.remove('foo');
assume(ee.listeners('foo').length).equals(1);
var actual = ee.listeners('foo')[0];
//
// In Node.js 8+ `EventEmitter#listeners()` returns the original listener
// also for once listeners.
//
assume(actual.listener || actual).equals(foo);
});
it('removes all assigned events if called without args', function () {
function foo() {}
function bar() {}
assume(ultron.remove()).equals(ultron);
ultron.on('foo', foo);
ultron.on('bar', bar);
ultron.on('baz', bar);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('bar').length).equals(1);
assume(ee.listeners('baz').length).equals(1);
ultron.remove();
assume(ee.listeners('foo').length).equals(0);
assume(ee.listeners('bar').length).equals(0);
assume(ee.listeners('baz').length).equals(0);
ee.removeAllListeners();
ultron.destroy();
ee = new EE();
ultron = new Ultron(ee);
assume(ultron.remove()).equals(ultron);
ultron.on('foo', foo);
ultron.on('bar', bar);
ultron.on('baz', bar);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('bar').length).equals(1);
assume(ee.listeners('baz').length).equals(1);
ultron.remove();
assume(ee.listeners('foo').length).equals(0);
assume(ee.listeners('bar').length).equals(0);
assume(ee.listeners('baz').length).equals(0);
});
it('removes multiple listeners based on args', function () {
function foo() {}
function bar() {}
function baz() {}
ultron.on('foo', foo);
ultron.on('bar', bar);
ultron.on('baz', baz);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('bar').length).equals(1);
assume(ee.listeners('baz').length).equals(1);
ultron.remove('foo', 'bar');
assume(ee.listeners('foo').length).equals(0);
assume(ee.listeners('bar').length).equals(0);
assume(ee.listeners('baz').length).equals(1);
});
it('removes multiple listeners if first arg is separated string', function () {
function foo() {}
function bar() {}
function baz() {}
ultron.on('foo', foo);
ultron.on('bar', bar);
ultron.on('baz', baz);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('bar').length).equals(1);
assume(ee.listeners('baz').length).equals(1);
ultron.remove('foo, bar');
assume(ee.listeners('foo').length).equals(0);
assume(ee.listeners('bar').length).equals(0);
assume(ee.listeners('baz').length).equals(1);
});
if ('undefined' !== typeof Symbol) it('works with ES6 symbols', function () {
var s = Symbol('s');
function foo() {}
function bar() {}
function baz() {}
ee.on(s, foo);
ultron.on(s, bar);
assume(ee.listeners(s).length).equals(2);
ultron.remove(s);
assume(ee.listeners(s).length).equals(1);
assume(ee.listeners(s)[0]).equals(foo);
ultron.once(s, bar);
assume(ee.listeners(s).length).equals(2);
ultron.remove(s);
assume(ee.listeners(s).length).equals(1);
assume(ee.listeners(s)[0]).equals(foo);
ultron.on(s, bar);
ultron.on(s, baz);
assume(ee.listeners(s).length).equals(3);
ultron.remove();
assume(ee.listeners(s).length).equals(1);
assume(ee.listeners(s)[0]).equals(foo);
ee.removeAllListeners();
ultron.destroy();
ee = new EE();
ultron = new Ultron(ee);
ee.on(s, foo);
ultron.on(s, bar);
assume(ee.listeners(s).length).equals(2);
ultron.remove(s);
assume(ee.listeners(s).length).equals(1);
assume(ee.listeners(s)[0]).equals(foo);
ultron.once(s, bar);
assume(ee.listeners(s).length).equals(2);
ultron.remove(s);
assume(ee.listeners(s).length).equals(1);
assume(ee.listeners(s)[0]).equals(foo);
ultron.on(s, bar);
ultron.on(s, baz);
assume(ee.listeners(s).length).equals(3);
ultron.remove();
assume(ee.listeners(s).length).equals(1);
assume(ee.listeners(s)[0]).equals(foo);
});
});
describe('#destroy', function () {
it('removes all listeners', function () {
function foo() {}
function bar() {}
function baz() {}
ultron.on('foo', foo);
ultron.on('bar', bar);
ultron.on('baz', baz);
assume(ee.listeners('foo').length).equals(1);
assume(ee.listeners('bar').length).equals(1);
assume(ee.listeners('baz').length).equals(1);
ultron.destroy();
assume(ee.listeners('foo').length).equals(0);
assume(ee.listeners('bar').length).equals(0);
assume(ee.listeners('baz').length).equals(0);
});
it('removes the .ee reference', function () {
assume(ultron.ee).equals(ee);
ultron.destroy();
assume(ultron.ee).equals(null);
});
it('returns booleans for state indication', function () {
assume(ultron.destroy()).is.true();
assume(ultron.destroy()).is.false();
assume(ultron.destroy()).is.false();
assume(ultron.destroy()).is.false();
});
});
});