A QA engineer walks into a bar
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We have wide range of clients from very technically sophisticated down to people who need guidance and hand-holding. QA, for me, is ensuring all clients have a good experience with the software and get value from our software.
( which was true only because but they didn't want to put any effort into finding bugs before release.)
The problem is that, unlike QA, the customers sometimes stop paying you when they discover bugs.
QA did a good job testing inputs to the orderBeer function. But they forgot to examine the other functions.