I don't remember where I took the test, but if you search on google you can find websites where you can take the test. But thanks to all who reply to my question. But I find an article on The Enneagram Blogspot that tells the difference between enfp that are 4 or 7 here the link, if you want to check it out :The Enneagram Blogspot: New! 4w3 vs. 7w6 - Misidentifying.
The article is pretty good!! It basically said that enfp that are 4s are emotionally based and enfp that are 7s are the thinking based. Cbella what you said about negative and positive emotions are mention the article