First interview: will I be tested?

The title has the gist of it, but I'll elaborate.

I'm in college, currently trying to get a summer job to earn some money before school starts back up again. Anyway, over this past year, I was a daily light-to-medium smoker, but since 5/23, I've smoked only 3 times, the most recent of which were this past Friday and Saturday.

I've got an interview at Fry's tomorrow, and I was wondering if anyone had any insight as to what type of testing Fry's does (UA or saliva), and given my circumstances, what type of strategy I should employ to pass that test. That said, the first obvious question is whether or not supermarkets in general (and Fry's, specifically) test at the first interview, on-site.

Thanks, any input is appreciated.