The other great combo is to play Test Run to install a Femme Fatale (or some other expensive program), and then, before your turn ends, play Scavenge to scavenge that Femme back in to play so it doesn't go to the top of your stack. congrats! You've just installed Femme Fatale for only 3 credits. Also keep in mind that you can make runs using the Femme between the test run and scavenge, possibly bypassing 2 different pieces of ice in the same turn....
That's a good idea using Test Run to tutor Femme and then play Scavenge on it. Thanks for sharing.