Crawling handling for a test subdomain

[Bruno-Hug]

This post is deleted!

[ForForce]

I think the answer your looking for is in the very link you provided

http://googlewebmastercentral.blogspot.in/2012/08/website-testing-google-search.html

1. Do not redirect only bots.... This is seen as deceptive and will get you a nice penalty.
2. 302 is a good solution.  Just make sure you do it with the same frequency you do for a real person... no special handling for google bot.
3. If you prefer one version remain indexed over another version, use the rel=“canonical” link attribute