paper.js/test/tests/Emitter.js

/*
 * Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
 * http://paperjs.org/
 *
 * Copyright (c) 2011 - 2016, Juerg Lehni & Jonathan Puckey
 * http://scratchdisk.com/ & http://jonathanpuckey.com/
 *
 * Distributed under the MIT license. See LICENSE file for details.
 *
 * All rights reserved.
 */

module('Emitter');

test('on()', function() {
    var emitter = new Base(Emitter),
        installed;
    // fake event type registration
    emitter._eventTypes = {mousemove: {install: function(){ installed = true;} } };
    equals(function() {
        return !emitter.responds('mousemove');
    }, true);
    emitter.on('mousemove', function() {});
    equals(function() {
        return emitter.responds('mousemove')
    }, true);
    equals(function() { return installed; }, true);
    // one time installation only
    installed = false;
    emitter.on('mousemove', function() {});
    equals(function() { return !installed; }, true);

    emitter.on('customUnregistered', function() {});
    equals(function() {
        return emitter.responds('customUnregistered')
    }, true);
});

test('off()', function() {
    var emitter = new Base(Emitter),
        uninstalled, called = 0,
        handler = function () {called++},
        handler2 = function () {};
    emitter._eventTypes = {mousemove: {uninstall: function(){ uninstalled = true;} } };

    emitter.on('mousemove', handler);
    emitter.on('mousemove', handler2);
    emitter.on('custom', handler);
    emitter.emit('mousemove');
    equals(function() { return called == 1; }, true);

    emitter.off('mousemove', handler2);
    emitter.emit('mousemove');
    equals(function() { return called == 2; }, true);
    equals(function() { return !uninstalled }, true);

    emitter.off('mousemove', handler);
    emitter.emit('mousemove');
    equals(function() { return called == 2; }, true);
    equals(function() { return uninstalled }, true);

    called = 0;
    emitter.emit('custom');
    equals(function() { return called == 1; }, true);
    emitter.off('custom', handler);
    emitter.emit('custom');
    equals(function() { return called == 1; }, true);
});

test('emit()', function() {
    var emitter = new Base(Emitter),
        called,
        handler = function (e) {called = e};
    // fake event type registration
    emitter._eventTypes = {mousemove: {} };
    emitter.on('mousemove', handler);
    emitter.on('custom', handler);

    emitter.emit('mousemove', 'mousemove');
    equals(function() {
        return called == 'mousemove';
    }, true);

    emitter.emit('custom', 'custom');
    equals(function() {
        return called == 'custom';
    }, true);
});