4d078fdb03* remove 'basically' from docs * remove 'simply' from docs * remove most uses of 'just' from docs
60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
# Testing on Headless CI Systems (Travis CI, Jenkins)
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Being based on Chromium, Electron requires a display driver to function.
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If Chromium can't find a display driver, Electron will fail to launch -
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and therefore not executing any of your tests, regardless of how you are running
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them. Testing Electron-based apps on Travis, Circle, Jenkins or similar Systems
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requires therefore a little bit of configuration. In essence, we need to use
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a virtual display driver.
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## Configuring the Virtual Display Server
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First, install [Xvfb](https://en.wikipedia.org/wiki/Xvfb).
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It's a virtual framebuffer, implementing the X11 display server protocol -
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it performs all graphical operations in memory without showing any screen output,
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which is exactly what we need.
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Then, create a virtual xvfb screen and export an environment variable
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called DISPLAY that points to it. Chromium in Electron will automatically look
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for `$DISPLAY`, so no further configuration of your app is required.
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This step can be automated with Paul Betts's
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[xvfb-maybe](https://github.com/paulcbetts/xvfb-maybe): Prepend your test
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commands with `xvfb-maybe` and the little tool will automatically configure
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xvfb, if required by the current system. On Windows or macOS, it will
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do nothing.
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```sh
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## On Windows or macOS, this invokes electron-mocha
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## On Linux, if we are in a headless environment, this will be equivalent
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## to xvfb-run electron-mocha ./test/*.js
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xvfb-maybe electron-mocha ./test/*.js
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```
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### Travis CI
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On Travis, your `.travis.yml` should look roughly like this:
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```yml
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addons:
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apt:
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packages:
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- xvfb
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install:
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- export DISPLAY=':99.0'
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- Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
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```
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### Jenkins
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For Jenkins, a [Xvfb plugin is available](https://wiki.jenkins-ci.org/display/JENKINS/Xvfb+Plugin).
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### Circle CI
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Circle CI is awesome and has xvfb and `$DISPLAY`
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[already setup, so no further configuration is required](https://circleci.com/docs/environment#browsers).
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### AppVeyor
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AppVeyor runs on Windows, supporting Selenium, Chromium, Electron and similar
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tools out of the box - no configuration is required.
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