The goal of gdalosx is to find out how to use travis to test a GDAL-dependent R package on OSX. GDAL has a pretty comprehensive CI test suite that I'm using as a guide.
Currently my build matrix is only trusty (Ubuntu 14.04) and xcode8 (OSX), just so I know it works in both environments. I know really nothing about OSX so this is helpful for knowing that we can support that platform for various R projects.
The R package here doesn't do anything interesting, the crux here is the .travis.yml and the badges in the readme.