(chore) Travis: Configure matrix jobs, one with X11 framebuffer and o…

…ne with headless environment.

.travis.yml

@@ -6,26 +6,25 @@ jdk:
 # use operating systems.
 os:
   - linux
-  #- osx
 
 # run in container und keep gradle cache.
 sudo: false
 cache:
   directories:
     - $HOME/.gradle
 
+# setup jobs.
+env:
+  - USE_FRAMEBUFFER=true
+  - USE_FRAMEBUFFER=false _JAVA_OPTIONS="-Djava.awt.headless=true -Dtestfx.robot=glass -Dtestfx.headless=true -Dprism.order=sw -Dprism.text=t2k -Dtestfx.setup.timeout=2500"
+
 # run on xvfb screen.
-#before_install:
-#  - export DISPLAY=:99.0
-#  - sh -e /etc/init.d/xvfb start
+before_install:
+  - if [ $USE_FRAMEBUFFER = "true" ]; then echo "starting xvfb..." && export DISPLAY=:99.0 && sh -e /etc/init.d/xvfb start; fi
 
 # skip install stage.
 install: true
 
 # run gradle build.
-env:
-  #- _JAVA_OPTIONS=
-  - _JAVA_OPTIONS="-Djava.awt.headless=true -Dtestfx.robot=glass -Dtestfx.headless=true -Dprism.order=sw -Dprism.text=t2k -Dtestfx.setup.timeout=2500"
-
 script:
   - ./gradlew build