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POHow do I test methods that are to be used together in isolation?
 

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  1. POHow do I test methods that are to be used together in isolation?
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    <p>Using this class:</p> <pre><code>var Observer = function Observer() { this._events = {}; }; Observer.prototype.on = function(k, v) { (this._events[k] = this._events[k] || []).push(v); }; Observer.prototype.off = function(k, v) { var hs; var i; var l; if (!k) { this._events = {}; return; } if (!v) { if (typeof this._events[k] !== 'undefined') { this._events[k] = []; } return; } hs = this._events[k]; i = 0; l = hs.length; while(i &lt; l) { if (hs[i] === v) { hs.splice(i); } i++; } }; Observer.prototype.emit = function(k) { var hs = this._events[k]; var args; var i; var l; if (hs) { args = [].splice.call(arguments, 1); i = 0; l = hs.length; while(i &lt; l) { hs[i].apply(this, args); i++; } } }; if (typeof exports !== 'undefined') { exports.Observer = Observer; } </code></pre> <p>and this test code:</p> <pre><code>var assert = require('assert'); var Observer = require('../../public/lib/Observer').Observer; describe('Observer', function() { beforeEach(function(done) { this.instance = new Observer(); done(); }); describe('#on', function() { describe('with an event and handler', function() { it('should call a callback', function(done) { var expected = 0; this.instance.on('a', function(actual) { assert.equal(expected, actual); done(); }); this.instance.emit('a', expected); }); }); }); describe('#off', function() { describe('with an event and a handler', function() { it('should not call the callback', function(done) { var expected = false; var actual = false; var f = function() { actual = true; }; this.instance.on('a', f); this.instance.off('a', f); this.instance.emit('a'); assert.equal(expected, actual); done() }); }); describe('with an event', function() { it('should not call the callback', function(done) { var expected = false; var actual = false; var f = function() { actual = true; }; this.instance.on('a', f); this.instance.off('a'); this.instance.emit('a'); assert.equal(expected, actual); done() }); }); describe('without arguments', function() { it('should not call the callback', function(done) { var expected = false; var actual = false; var f = function() { actual = true; }; this.instance.on('a', f); this.instance.off('a'); this.instance.emit('a'); assert.equal(expected, actual); done() }); }); }); describe('#emit', function() { describe('with an event and variable arguments', function() { // I've already used this method in the other tests, so it must work in // order for them to pass. But that's not isolated testing, help :(.. }); }); }); </code></pre> <p>Running these tests (with mocha) will pass them all however they are tested together.</p> <ol> <li><p>Is this the correct way of testing this code, using all the methods involved in the flow(s) of one?</p></li> <li><p>How do I test these methods in isolation?</p> <p>2.1. I can't look inside the structure of what I'm testing, because I'd just be testing the implementation, not the interface.</p> <p>2.2. What then, are the criteria for just <code>.on(ev, fn)</code> being successful?</p></li> </ol>
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