karma-rollup-plugin

A Karma preprocessor plugin to offer seamless integration with rollup

This plugin is a Karma preprocessor to compile and bundle your spec entry point on the fly. It works seamless with all Rollup plugins.

Features

supports Rollup by default
supports both Babel and Buble as the ES2015 compiler
sourceMap
recompiling of dependencies when files changes
ES3, ES5, ES2015, ES2016, and ES2017 (with Babel or Buble)

Installation

The easiest way is to keep karma-rollup-plugin as a devDependency. You can simple do it by:

npm i karma-rollup-plugin --save-dev

Configuration

Note! As a rule of thumb, use of umd format doesn't make sense in tests, and will throw a warning without a module name.

Following code shows the default configuration

// karma.conf.js
module.exports = function (config) {
  config.set({
    preprocessors: {
     'test/**/*.js': ['rollup']
    },
    rollupPreprocessor: {
      // rollup settings. See Rollup documentation
      plugins: [
        buble() // ES2015 compiler by the same author as Rollup
      ],
      // will help to prevent conflicts between different tests entries
      format: 'iife',
      sourceMap: 'inline'
    }
  });
};