how to make 100% sure laptop is fine before the vendor ships the laptop

i contacted a vendor about buying the MSI GT70 Dominator-2293 , and he said he will conduct for me any tests necessary before shipping the laptop to me , and because im shipping for usa to kuwait if that laptop turns to be defective , shipping it back would be disastrous to me , so what sort of tests and screenshots of those test can make sure the laptop have nothing wrong with it ????? i asked him initially for a furmark stress test screenshot to check the gpu temperature at full load!
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All you can really ask of them is to be thorough. I don't think the vendor is willing to go outside of production protocol testing, and if he is, still within reason. There's only so much they can test for, but remember that MSI conducts their own tests as well, so by purchasing through a reseller you're getting a second layer of quality assurance when they test.

There is no bullet proof way of assuring the laptop will not have a problem in the near future or when it arrives. Anything can happen, though chances are small.