Test Plots on Travis: GKS can't open display

I played with a really clean version. While it finally worked on Linux, it didn’t on osx, the reason being that I can’t install ffmpeg via Travis on an osx. I checked with Plots to see how they do it, and they don’t. The tests for osx are skipped.
Not sure how to proceed…

Here’s the repo: https://github.com/yakir12/Saves.jl
Ignore this line, it was my feeble attempt to install ffmpeg on the mac.