A Karma plugin that allows testing CommonJS modules in the browser. So if you are using Browserify for instance, you might find this plugin useful...

Creating a single bundle means "recompiling" the bundle anytime any file changes. On big project, this can significantly slow down the development. This plugin processes only files that changed.

The easiest way is to keep karma-commonjs as a devDependency:

npm install karma-commonjs --save-dev

which should result in the following entry in your package.json:

{
  "devDependencies": {
    "karma": "~0.10",
    "karma-commonjs": "~0.2"
  }
}

// karma.conf.js
module.exports = function(config) {
  config.set({
    frameworks: ['jasmine', 'commonjs'],
    files: [
      // your tests, sources, ...
    ],

    preprocessors: {
      '**/*.js': ['commonjs']
    }
  });
};

Additionally you can specify a root folder (relative to project's directory) which is used to look for required modules:

commonjsPreprocessor: {
  modulesRoot: 'some_folder'  
}

When not specified the root folder default to the karma.basePath/node_modules configuration option.

For an example project, check out Karma's client tests.

For more information on Karma see the homepage.