On a previous post I wrote about how to write tests for polymer components. Now, I want to hook those tests into my automated test suite that runs for all commits in a repo. The problem is that we are kind of in a low budget so we don’t have a selenium grid we can connect to. What we do have is a machine where we have Jenkins installed. Because we run many different jobs in this machine, we usually use docker to keep our environment isolated.
The problem now is that we can’t run polymer tests in a headless browser like phantomjs, because it is not supported. We have to run our tests in a real browser like Chrome or Firefox. These browsers need a GUI to work which docker doesn’t provide, so we have to do a few things to work around this issue.
Xvfb stands for X virtual framebuffer. It is a display server that implements the X11 protocol, but does everything in memory, so it doesn’t really need a screen to work. This is exactly what we need. To use it we just need to create a Dockerfile that uses xvfb to run the tests: