Intern: geezer edition. A next-generation code testing stack for last-generation JavaScript code.

Usage no npm install needed!

<script type="module">
  import internGeezer from '';


“We need to support old IE. Make the Intern we really, really hate do the testing” Build Status

Intern is a complete test stack for JavaScript designed to help you write and run consistent, high-quality test cases for your JavaScript libraries and applications. It can be used to test any JavaScript code. Its functional testing capabilities can even be used to test non-JavaScript Web and mobile apps, if you really want.

Learn more about Intern at

This branch

The geezer branch provides support for testing ancient browsers that do not support EcmaScript 5 (IE 6–8). It does not use the Chai library, as Chai also requires ES5. Instead, there is an assertion library at intern/assert that is API-compatible with Chai’s assert-style API. This module is not covered under the Dojo Foundation CLA governing the rest of the Intern project.

This branch will only be maintained for as long as absolutely necessary since it is ugly and a burden.

Quick start

  1. Install from npm

    cd /my/project/root
    npm install intern-geezer --save-dev
  2. Create a copy of the example configuration file in your package’s test directory and edit appropriately. See the configuration documentation for a list of all available options.

    mkdir tests ; cp node_modules/intern-geezer/tests/example.intern.js tests/intern.js
  3. Verify your configuration works by running the Node.js client and seeing that no errors are output.

    node_modules/.bin/intern-client config=tests/intern
  4. Start writing tests! See the writing tests documentation and the Intern tutorial to learn how.

More information


Intern is available under the terms of the New BSD License. All code, with the exception of portions of the assert.js library and tests in the geezer branch, is developed under the terms of the Dojo Foundation CLA.

© 2012–2013 Colin Snover
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