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I added the ability to test Mac OS X on Travis CI. The solution is kind of heavy handed and involves changing a lot of .travis.yml and adding some helper scripts, but it works and it seems to be the only way to test Python projects on OS X. I used another repository for inspiration on how to format .travis.yml and write the scripts to allow for testing on OS X.
Here is a Travis CI build on my fork testing both Linux and OS X: https://travis-ci.org/philipbl/doit/builds/78691539
Currently, the OS X tests get stuck (as described in #101) and eventually time out. One of the tests (pypy3 on OS X) fails for other reasons, so I made that test optional.