How to use package from community-testing

[Łukasz Michalski]

Hi,

I am running arch-linux with cyrus-imapd as mail server for several 
years and now cyrus-imapd appeared in community-testing.

I am planning upgrade and switch from cyrus-imapd aur package to version 
from community-testing. What is a recommended way to test only this package?

If I enable community-testing in pacman.conf, then doing pacman -Su will 
still pull official packages from community until I explicitly request a 
version from testing?

Regards,
Łukasz