Atom Karma Test Runner

Run karma tests directly from Atom IDE. No additional server or setup needed.

Package settings:

• nodeBinaryPath Path to the node executable. Should match the result of which node in your terminal. Defaults to /usr/local/bin/node.
• karmaConfigFileName Karma configuration file. Defaults to karma.conf.js.
• karmaReporter Karma reporter. The plugin looks best with karma-mocha-reporter. Just make sure it is installed for the package you are executing tests for.
• runActiveFileOnly Whether plugin will execute every test karma is configured for, or run just currently active file. Please note that running a single file requires additional configuration see below.
• env Any additional environment variables.

Running:

Open a test file and Packages -> atom-karma-test-runner -> run from atom menu. This plugin looks for the closest package.json to the current file to get karma config file and karma executable.

Configuring plugin to execute a single file:

By default every singe test that is karma has been configured for will be executed. To run only a single file that is currently active in atom set runActiveFileOnly to true in the package settings and update karma.conf.js or karma configuration file as follows:

const defaultPath = 'lib/**/test/*.js' // the path you would normally configure karma
const path = (process.argv[process.argv.length - 1] || defaultPath);
module.exports = (config) => {
  config.set({
    ...
    files: [path],
    ...
  })
};

Please see complete example: karma.conf.js

Karma does not provide a standard documented way to run a single test or a file. Few options are available:

• with jasmine one may use focused specs change it -> fit or describe -> fdescribe. But this requires a code change and may easily get committed by mistake.
• there is also an undocumented --grep karma flag to search for a test description. But this would run every single test anyways and just filters the output for the searched term.
• provide a path as an extra argument for karma and format config file to read this argument. That is the option I ended up using.