66 lines
2.4 KiB
JavaScript
66 lines
2.4 KiB
JavaScript
/**
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* Tests 1-N message dispatch interface
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*
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* Copyright (C) 2014 Mike Gerwitz
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*
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* This file is part of jsTonic.
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*
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* jstonic is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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var Sut = require( '../../' ).event.Eventable,
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expect = require( 'chai' ).expect;
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describe( 'event.Eventable', () =>
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{
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/**
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* One critical design decision of Eventable was to produce an interface
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* that is compatible with Node.js' EventEmitter prototype---this allows
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* existing Node libraries that make use of it to be used wherever an
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* Eventable is expected, without any frustrating adapter code that
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* would deter developers.
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*
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* Note an important distinction here: Eventable defines a *subset* of
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* the methods implemented by EventEmitter; so implementors of Eventable
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* may provide other methods in addition, and EventEmitter likewise does
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* the same; the only goal we care about is that EventEmitter can be
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* used polymorphically with regards to Eventable. Therefore, while it's
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* true that EventEmitter can be used wherever Eventable is expected,
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* the reverse is not necessarily true.
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*
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* This test was created when the Event interface had already been
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* declared "frozen", so the below methods should be correct.
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*/
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it( 'is compatible with Node.js Event prototype', () =>
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{
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let f = ( ev, listener ) => {};
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let njs_ev = {
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addListener: f,
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on: f,
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once: f,
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removeListener: f,
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removeAllListeners: f,
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setMaxListeners: f,
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listeners: f,
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emit: f,
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};
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// via ease.js ECMAScript interop
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expect( Sut.isCompatible( njs_ev ) ).to.be.true;
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} );
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} );
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