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POAccess inner function variables in Javascript
 

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    <p>In many frameworks, internal function variables are used as private variables, for example</p> <pre><code>Raphael = (function(){ var _private = function(a,b) {return a+b;}; var _public = function(a) {return _private(a,a);} var object = {mult2:_public}; return object; })(); </code></pre> <p>here, we cannot access from the global namespace the variable named <code>private</code>, as it is an inner variable of the anonymous function in the first line.</p> <p>Sometimes this function is contains a big Javascript framework, so that it wouldn't pollute the global namespace.</p> <p>I need to unit tests some object <code>Raphael</code> uses internally (in the above example, I wish to run unit tests on the object <code>private</code>). How can I test them?</p> <p><strong>edit:</strong> I received comments about unit tests which are supposed to test public interfaces.</p> <p>Let me specify a use case. I'm writing a library called <code>Raphael</code>. This library is supposed to add only a single name to the global namespace, and nothing more. This is a peculiar requirement for Javascript, since Javascript does not have namespaces.</p> <p>Let's say <code>Raphael</code> uses a linked list. If Javascript had the notion of packages, I would do</p> <pre><code>require 'linked_list' Raphael = (function(){/* use linked list */})(); </code></pre> <p>However Javascript does not allow me to do that in any way that wouldn't pollute the global scope with the linked list object! I'm therefore bound to inline <code>linked_list</code> into Raphael's local scope:</p> <pre><code>Raphael = (function(){ /* implement linked list */ var linked_list = function(){/*implementation*/}; })(); </code></pre> <p>And now I want to test <code>linked_list</code> implementation.</p>
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    1. USElazar Leibovich
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    1. COthe idea behind unittests is to test public functions/methods only
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    2. CO@Andrey, Javascript is not your everyday language! You cannot import other modules in a sane way, so if I'll include a small, say, linked list implementation for Raphael to use, it'll have to be inlined in Raphael's internal function, so that it wouldn't be exposed to the user of Raphael. I can't just `#include` it...
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      1. USElazar Leibovich
    3. COSee: http://stackoverflow.com/questions/2230469/javascript-sandbox-unit-testing http://stackoverflow.com/questions/716207/testing-private-functions-in-javascript http://stackoverflow.com/questions/1881078/testing-javascript-functions-inside-anonymous-functions et all
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