Module loader for testing

example-tests.js

var example = {
    //js: 'https://gist.github.com/prettycode/5401842/raw/example.js'
    js: 'http://fiddle.jshell.net/js/heyoffline.js?StillNoSpring'
}

loadScript(example.js, {
    document: {
        createElement: function(tag) {
            return {
                setAttribute: function(key, value) {
                    this._attribute[key] = value;
                },
                submit: function() {
                    if (this._attribute['action'] !== example.js) {
                        throw;
                    }
                }
            };
        }
    }
});

example.js

// this is the script that needs to be tested

function submitForm(url, data) {
    var formEl = document.createElement('form');
    
    for (var key in data) {
        if (data.hasOwnProperty(key)) {
            formEl.setAttribute(key, data[key]);
        }
    }
    
    formEl.action = url;
    formEl.submit();
}

loadScript.js

function loadScript(url, context) {
    var scriptEl = document.createElement('script'),
        contextKeys = Object.keys(context).join();

    jQuery.get(url, function(scriptText) {
        var tempKey = '$' + Date.now();

        window[tempKey] = Object.keys(context).map(function(key) {
            return context[key];
        });

        scriptEl.innerHTML = '' +
            '(function(' + contextKeys + ') {' + 
                scriptText +
            '}).apply(this, window.' + tempKey + ');'
        ;

        document.body.appendChild(scriptEl);

        delete window[tempKey];
    });
}