Github user kxepal commented on the pull request:
https://github.com/apache/couchdb-chttpd/pull/106#issuecomment-196318212
The trick that `?_` macros doesn't involve function execution right now,
and delegate it to the time when test will be actually processed by eunit.
Otherwise it's easy to make a case when you can execute part of the code in
between setup and actual test call.
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