Code coverage report for object/reduce.js

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define(['./forOwn', './size'], function(forOwn, size) {
 
    /**
     * Object reduce
     */
    function reduce(obj, callback, memo, thisObj) {
        var initial = arguments.length > 2;
 
        if (!size(obj) && !initial) {
            throw new Error('reduce of empty object with no initial value');
        }
 
        forOwn(obj, function(value, key, list) {
            if (!initial) {
                memo = value;
                initial = true;
            }
            else {
                memo = callback.call(thisObj, memo, value, key, list);
            }
        });
 
        return memo;
    }
 
    return reduce;
 
});