karma-electron

Karma launcher and preprocessor for Electron

This was written to allow for directly testing in Electron where we might want require to work automatically

Features:

• Tested via CI on Linux and Windows
• Support for Node.js integration in the renderer process (e.g. process, require, __filename)
• Support for hidden browser windows
• Support for isolated test runs to prevent cookie/localStorage pollution

Getting Started

On a project that has been set up with karma init already, install the module via:

# Install our module and `electron-prebuilt`
npm install karma-electron electron-prebuilt

Then, configure the module:

// Inside `karma.conf.js`
browsers: ['Electron']

// If you would like Node integration support (e.g. `require`)
//   then, you must include this in `preprocessors` and `client`
// DEV: preprocessors is for backfilling `__filename` and local `require` paths
preprocessors: {
  '**/*.js': ['electron']
},
// DEV: `useIframe: false` is for launching a new window instead of using an iframe
//   In Electron, iframes don't get `nodeIntegration` priveleges yet windows do
client: {
  useIframe: false
}

Then, we can run Karma:

karma start

Documentation

Environment variables

• ELECTRON_BIN - Override path to use for electron
  • By default, we will use path given by electron-prebuilt

Example:

ELECTRON_BIN=/usr/bin/electron karma start

Configuration

We support configuration via Karma's custom launcher inheritance:

• flags Array - List of Chromium flags to alter Electron's behavior
  • https://github.com/atom/electron/blob/v0.36.9/docs/api/chrome-command-line-switches.md
  • We added support for a --show to allow making the Karma window visible
• userDataDir String - Directory to store cookies/localStorage information
  • By default, this is a random directory generated by Karma (e.g. /tmp/karma-5355024)

Example:

module.exports = function (config) {
  config.set({
    // Specify usage of our custom launcher
    browsers: ['CustomElectron'],

    // Define a custom launcher which inherits from `Electron`
    customLaunchers: {
      CustomElectron: {
        base: 'Electron',
        userDataDir: __dirname + '/.electron',
        flags: ['--show']
      }
    }
};

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint via npm run lint and test via npm test.

Donating

Support this project and others by twolfson via gratipay.

Unlicense

As of Mar 03 2016, Todd Wolfson has released this repository and its contents to the public domain.

It has been released under the UNLICENSE.