The good practice after reassemble:
[be sure chamber is empty, no ammo in magazine]
1. function check (no magazine inserted):
- rack the slide, press the trigger, release the trigger -> you know action works
- rack the slide, press the trigger, don't release the trigger, rack the slide, release the trigger (reset), pull the trigger -> you know action / reset works
2. firing pin / striker test (no magazine inserted):
- rack the slide, muzzle up. Drop pencil with rubber end into the barrel. Pull the trigger (with muzzle up). Pencil should jump out from the barrel.
3. Magazine release button test:
- insert empty magazine, rack the slide (slide should stay locked back)
- release slide, drop the magazine (magazine should freely goes down from the grip)
If all works, your firearm is perfectly fine and will shoot live ammo for sure.
I do this procedure every single time after breaking pistol down. This is a tool which save lives... has to be in perfect shape 24/7/365