Wow, Daja Vu!
Besides a 9 iron, there isn�t any official physical test you speak of. You can run a design of experiments to prove your joints are strong, but I wouldn�t suggest pushing, slapping or prying on a customers solder joints. Any such poking may make the joint weak. Do a DFM and then establish a visual guideline on what an acceptable joint looks like and what a failed one looks like (or use the pix in IPC).
There are Thermal, Vibe, and Shock tests you can do as well. These are pretty well documented and represent what your board would experience in real life, which is a lot better than an operator poking your solder joints with a crow bar.
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