JasonYao
commented
7 years ago Travis CI environment isn't a fully clean one, it's pre-built images with certain things already installed. Better than nothing to see if there's breakage, but not worth the time in this particular instance.
Vagrant build for OSX sierra test didn't work manually, so it's assumed that it wouldn't work in an automated fashion either.
Use git hooks to download, install, and run a vagrant environment for testing, or using Travis CI.
Should be easy to test on Ubuntu 16.04, though testing on OS X would have to stay manual