Try again to run specs on 🐧

.travis.yml

@@ -13,6 +13,8 @@ install:
   - nvm use $NODE_VERSION
   - if [ $TRAVIS_OS_NAME == "linux" ]; then
       sudo apt-get install build-essential git libgnome-keyring-dev fakeroot;
+      export DISPLAY=:99.0;
+      sh -e /etc/init.d/xvfb start;
     fi
 
 script: script/cibuild

build/Gruntfile.coffee

@@ -226,7 +226,7 @@ module.exports = (grunt) ->
   ciTasks.push('set-version', 'check-licenses', 'lint')
   ciTasks.push('mkdeb') if process.platform is 'linux'
   ciTasks.push('create-windows-installer') if process.platform is 'win32'
-  ciTasks.push('test') if process.platform is 'darwin'
+  ciTasks.push('test') if process.platform in ['darwin', 'linux']
   ciTasks.push('codesign')
   ciTasks.push('publish-build')
   grunt.registerTask('ci', ciTasks)