Canary
(canary testing)
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In software testing, a canary
(also called a canary test) is a push of programming code changes to a small
number of end users who have not volunteered to test anything. The goal of a
canary test is to make sure code changes are transparent and work in a real
world environment.
Canary tests, which are often automated, are run after
testing in a sandbox environment has been completed. Because the canary is
only pushed to a small number of users, its impact is relatively small should
the new code prove to be buggy and changes can be reversed quickly.
In canary testing, a small subset of traffic serves as
a test for updates. If anything in the update causes problems, it alerts the
IT team before a large group of users feel the effects.
The word canary was selected to describe the code push
because just like canaries that were once used in coal mining to alert miners
when toxic gases reached dangerous levels, end users selected for testing are
unaware they are being used to provide an early warning.
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