How to not allow search engines index your pages

If i was developing a test site live but i didn't want google or any other search to index those pages, how do i do that?

Thanks everyone:)

A robots.txt file will do what you want, at least for search engines that play nicely.

http://en.wikipedia.org/wiki/Robots_exclusion_standard

You would have something like

Code:

---

User-agent: *
Disallow: /test-site/

---

in the file.