For me, I shoot it straight out of the box without cleaning and lubing the pistol. If it shoots a 100rds that way, i'll take it home and clean/lube it. Shoot it again a few hundred rounds and if it does not malfunction in anyway, then I consider it reliable for daily carry.
Magazines are the other thing I check out first hand. If I can't reliably load or cycle rounds in the mag (in the case of some Keltecs), I will not carry it.