Clojurians Log v2
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test-check 2017-07-04
mattly 2017-07-04T21:15:31.983266Z
so just as a testament to the power of property-based testing:
mattly 2017-07-04T21:16:17.989504Z
the harness I have for testing calculations & queries against the data warehouse I manage an application front-end for just caught a super-rare edge case
mattly 2017-07-04T21:16:24.990477Z
doesn't actually happen against production data
mattly 2017-07-04T21:16:37.992104Z
but it could
mattly 2017-07-04T21:17:13.996842Z
my test suite started running monday morning, and test.check generated this edge case, and cranked on it for over 30 hours, approx 200k iterations, until it isolated the problem
mattly 2017-07-04T21:17:31.999551Z
and I look at it and go, oh, of course!
mattly 2017-07-04T21:17:53.002593Z
and it was like one of these little 2 character fixes
mattly 2017-07-04T21:18:19.006432Z
but had the problem occurred against production data, nobody ever would have known
> doesn't actually happen against production data > but had the problem occurred against production data, nobody ever would have known So how do you know it didn't?