How to make Google not index a subdomain?

[Datalife]

Hi forum,

I have got a question, but should be a piece of cake.

I just want to confirm with someone how do I block search engines (all of them) from a testing subdomain?

Lets say my domain is mydomain.com

My subdomain is test.mydomain.com

So, in my robots.txt file...

Should it be like this:

Agent: *
Disallow:/test/

Is the above the right htaccess command and should this be placed in the main public_html folder?

My subdomain redirects to a subdomain not a subdirectory..it redirects to http://test.mydomain.com

Thanks for any clarifications