How do you determine whether they are acceptable?

Say you just bought 100 parts, your weekly acquisition, and you want to verify that they're acceptable. What do you do? Surely you don't just "assume" that they're OK and solder them into your board, with $2500's-worth of other components. OTOH, since it's an ISP part, you don't socket 'em assuming that if they don't work you'll just swap 'em out. Surely there's some way of verifying basic functionality without the tens of man-hours per unit that's required to "fiddle" with 'em if they don't behave normally.

What's a good go/no-go procedure?

Has anybody ever written a RAM test or I/O test, etc, for the purpose of avoiding ruining a good board with a bad MCU? Now that there are parts with a significant amount of XRAM on board, there should be a way of detecting any faults. Do production users just plug-em-in-and-hope?

RE