Configure virtual display server on Linux

kgryte · kgryte · commit 9081b6de975b · 2017-12-07T13:03:43.000-08:00
For background, see - https://github.com/electron/electron/blob/63c91e7dd3764499d846f7e0b384d82d1da2bbc5/docs/tutorial/testing-on-headless-ci.md#travis-ci
diff --git a/.travis.yml b/.travis.yml
@@ -32,7 +32,7 @@ os:
   - linux
   - osx
 
-# Compiling native modules for io.js v3.x.x or Node.js >=v4.0.0 requires a C++11 standard-compliant compiler. Specifically, either gcc >=4.8 or clang >=3.5. Add-ons are Linux-specific.
+# Compiling native modules for io.js v3.x.x or Node.js >=v4.0.0 requires a C++11 standard-compliant compiler. Specifically, either gcc >=4.8 or clang >=3.5. Add-ons are Linux-specific. Electron requires a virtual display server (xvfb) on Linux.
 addons:
   apt:
     sources:
@@ -45,6 +45,7 @@ addons:
       - g++-5-multilib
       - gfortran-5
       - gfortran-5-multilib
+      - xvfb
       - unzip
 
 
@@ -85,6 +86,8 @@ before_install:
       ln -s /usr/bin/gcc-5 $HOME/bin/gcc;
       ln -s /usr/bin/g++-5 $HOME/bin/g++;
       ln -s /usr/bin/gfortran-5 $HOME/bin/gfortran;
+      export DISPLAY=':99.0';
+      Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &;
     else
       brew cask uninstall oclint;
       brew update;
