Testing of an irule before implementation.

Perhaps the fastest way of doing that is to use an extra IF condition

if {[IP::client_addr] == "yo.ur.test.ip"}{ your-irule-logic }

For a more complicated implementation where there are many testers accessing from various IP addresses, I use a secret HTTP path which inserts a special testing cookie. This will relieve from the burden of managing the "Allowed Testers IP addresses".