"It's not a solution, it's an excuse for lazy testing." How do you test absolutely everything? in all the environments? with every possible user? On the other

"It's not a solution, it's an excuse for lazy testing." How do you test absolutely everything? in all the environments? with every possible user? On the other hand it can be also used as you mention and here I think about the software on calculators as the 12C... which probably could have a bug... that you can't fix.