In contrast to other display servers, Xvfb performs all graphical operations in virtual memory without showing any screen output. 0' apt: sources: - google-chrome packages: - google-chrome-stable script: - xvfb-run wct Before we can use Xvfb, we need to install it (along with the browser we want if it's not already loaded). Although OSX comes with bundled with xvfb, it does not have the corresponding xvfb If you elect not to use Xvfb, you will need to have a browser and graphical display to run jasmine-headless-webkit -c. Rename the directory “android-sdk” then within android-sdk/tools issue the command: e2e: build.