+before_script:
+ - "export DISPLAY=:99.0"
+ - "sh -e /etc/init.d/xvfb start"
+ - sleep 3 # give xvfb some time to start
+# really?
+# watch https://docs.travis-ci.com/user/gui-and-headless-browsers/ to
+# see if a less fragile version comes up (with services maybe)
+