/**
 * Tests 1-N message dispatch interface
 *
 *  Copyright (C) 2014 Mike Gerwitz
 *
 *  This file is part of jsTonic.
 *
 *  jstonic is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

var Sut    = require( '../../' ).event.Eventable,
    expect = require( 'chai' ).expect;


describe( 'event.Eventable', () =>
{
    /**
     * One critical design decision of Eventable was to produce an interface
     * that is compatible with Node.js' EventEmitter prototype---this allows
     * existing Node libraries that make use of it to be used wherever an
     * Eventable is expected, without any frustrating adapter code that
     * would deter developers.
     *
     * Note an important distinction here: Eventable defines a *subset* of
     * the methods implemented by EventEmitter; so implementors of Eventable
     * may provide other methods in addition, and EventEmitter likewise does
     * the same; the only goal we care about is that EventEmitter can be
     * used polymorphically with regards to Eventable. Therefore, while it's
     * true that EventEmitter can be used wherever Eventable is expected,
     * the reverse is not necessarily true.
     *
     * This test was created when the Event interface had already been
     * declared "frozen", so the below methods should be correct.
     */
    it( 'is compatible with Node.js Event prototype', () =>
    {
        let f = ( ev, listener ) => {};

        let njs_ev = {
            addListener:        f,
            on:                 f,
            once:               f,
            removeListener:     f,
            removeAllListeners: f,
            setMaxListeners:    f,
            listeners:          f,
            emit:               f,
        };

        // via ease.js ECMAScript interop
        expect( Sut.isCompatible( njs_ev ) ).to.be.true;
    } );
} );