jm + test   4

Why did Apple, Amazon, Google stocks crash to the same price today?
Nasdaq said in a statement that "certain third parties improperly propagated test data that was distributed as part of the normal evening test procedures."

"For July 3, 2017, all production data was completed by 5:16 PM as expected per the early close of the markets," the statement continued. "Any data messages received post 5:16 PM should be deemed as test data and purged from direct data recipient's databases. UTP (Unlisted Trading Privileges) is asking all third parties to revert to Nasdaq Official Closing Prices effective at 5:16 PM."
testing  fail  stock-markets  nasdaq  test-data  test  production  integration-testing  test-in-prod 
july 2017 by jm
CD at LMAX: Testing into Production and Back Again
Chock-full of excellent build/test ideas from LMAX's Continuous Delivery setup. Lots of good ideas to steal
testing  lmax  build  test  continuous-delivery  dev 
may 2016 by jm
Hermetic Servers
'What is a Hermetic Server? The short definition would be a “server in a box”. If you can start up the entire server on a single machine that has no network connection AND the server works as expected, you have a hermetic server! This is a special case of the more general “hermetic” concept which applies to an isolated system not necessarily on a single machine.

Why is it useful to have a hermetic server? Because if your entire [system under test] is composed of hermetic servers, it could all be started on a single machine for testing; no network connection necessary! The single machine could be a physical or virtual machine.'

These also qualify as "fakes", using the terminology Martin Fowler suggests at http://martinfowler.com/bliki/TestDouble.html , I think
google  testing  hermetic-servers  test  test-doubles  unit-testing 
may 2013 by jm
Why did infinite scroll fail at Etsy?
'A/B testing must be done in a modularized fashion. The “fail” case he gave was when Etsy spent months developing and testing infinite scroll to their search listings, only to find that it had a negative impact on engagement.' [...] 'instead of having the goal of “test infinite scroll,” Etsy realized it needed to test each assumption separately, and this going forward is their game plan.'
usability  testing  design  etsy  ab-testing  test  modularization  via:hn 
january 2013 by jm

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