[almighty] Testing with Firefox on the CI

[Max Rydahl Andersen]

My guess is ci centos haven't done much visual testing of their builds 
yet, but xvfb + and the jenkins plugin 
(https://wiki.jenkins-ci.org/display/JENKINS/Xvfb+Plugin) is what I 
normally used. Historically its been hard to ensure it works on all 
jenkins instances due to missing X being available. Especially when 
docker is involved.

Calling it directly from a makefile I reckon is doable too thus
I think the fastest way to do this is to simply do a PR and see what 
happens.
If it works - great, if not - then we got questions and PR for KB and 
team to help out with.

/max

> Hi all,
>
> as we had some problems with Firefox and phantomJS is WebKit only, we
> are currently looking for ways of running Firefox on the Jenkins. The
> challenge are not the tests itself, they are running fine on Firefox,
> but the "physical" running of Firefox (which is not available in a
> "headless" version) on the Jenkins server in a "batch mode".
>
> @KB: do you know if that is even a problem? So maybe Jenkins or the
> setup of our Jenkins already has something in place that enables to
> run x applications in the background?
>
> As an alternative, I used a headless x server before. In that setup,
> the "headlessness" is delegated to the whole x environment and the
> Firefox just runs as normal. xorg provides a "virtual framebuffer"
> version of xorg for that case:
>
>   xorg-x11-server-Xvfb.x86_64 : A X Windows System virtual framebuffer 
> X server
>
> In an ideal case, something like that should be sufficient before
> running the tests:
>
>   Xvfb :99 &
>   export DISPLAY=:99
>   ./run_functional_tests.sh (or something else)
>
> What I don't know yet is if this requires root or any other resource
> that is not available in the docker / Jenkins environment.
>
> Anyone has experience with that?
>
> -- Michael
>
> -- 
> Michael Kleinhenz
> Principal Software Engineer
>
> Red Hat Deutschland GmbH
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> Germany
>
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/max
http://about.me/maxandersen