At the moment Travis is not running the test build (it's actually not even listing it as a build). You can look at master, 3.6, or 3.5 to see that only the docs and coverage builds are being run: https://travis-ci.org/python/cpython/branches . I don't know why this is as it was fine yesterday and then stopped working today. The last change was from Antoine but its own Travis run ran fine so I don't think that caused the problem: https://github.com/python/cpython/commits/master/.travis.yml . If anyone can figure out if this is somehow our fault that would be great (I can't see how it is).
But the key thing is to be aware that Travis being green just means the docs built fine. So until this is resolved, try to remember to check if the coverage test run passes if you want Travis to check your non-doc changes.