The test intermittently fails on OSX. For some reason start(PORT) doesn't always fail when PORT is in use, so we timeout because the handler is never called. I suspect it's because of how SO_REUSEADDR and SO_REUSEPORT are handled on sockets sever-side on OSX. Since httpd is used for unit tests, there is little risk in disabling the test on OSX.
The alternative is to check for a timeout, and in that case switch to another port - which is cumbersome, and not the purpose of the test.
Differential Revision: https://phabricator.services.mozilla.com/D14756
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extra : moz-landing-system : lando