1. Kumar McMillan
  2. nosejs


nosejs /

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NoseJS is a Nose plugin to run JavaScript tests using Rhino in a Java subprocess.


First, you need to download Rhino. More on that below.

You can get NoseJS with easy_install

$ easy_install NoseJS

Or you can clone the source using Mercurial from http://bitbucket.org/kumar303/nosejs/ and install it with

$ python setup.py develop


Here is the most basic way to invoke NoseJS (assumes you've downloaded Rhino into ~/src)

$ nosetests --with-javascript --rhino-jar ~/src/rhino1_7R1/js.jar

This command would look for any files along Nose's path ending in .js that match Nose's current test pattern (by default: files with "test" in the name), collect them all, then execute them using Rhino in a Java subprocess at the end of all other tests.

The idea behind NoseJS is that you might have a Python web application that relies on JavaScript for some of its functionality and you want to run both Python and JavaScript tests with one command, nosetests. You can put these JavaScript tests wherever you want in your project.

Here is a more realistic example that shows how the Fudge project is tested simultaneously for Python and JavaScript functionality. Its project layout looks roughly like this:

|-- fudge
|   |-- __init__.py
|   |-- patcher.py
|   |-- tests
|   |   |-- __init__.py
|   |   |-- test_fudge.py
|   |   |-- test_patcher.py
|-- javascript
|   |-- fudge
|   |   |-- fudge.js
|   |   |-- tests
|   |   |   |-- test_fudge.html
|   |   |   `-- test_fudge.js
`-- setup.py

Both Python and JavaScript tests can be run with this command:

$ nosetests  --with-javascript \
             --rhino-jar ~/src/rhino1_7R1/js.jar \
             --with-dom \
             --load-js-resource jquery-1.3.1.js \
             --load-js-resource jquery/qunit-testrunner.js \
             --js-test-dir javascript/fudge/tests/
Test Fake
  can find objects
  can create objects
  expected call not called
  call intercepted
  returns value
  returns fake
Test ExpectedCall
  ExpectedCall properties
  call is logged
Test fudge.registry
  expected call not called
  start resets calls
  stop resets calls
  global stop
  global clear expectations

Loaded 6 JavaScript files

Ran 54 tests in 0.392s


Be sure to read the Caveats section below ;)

Specifying a path to JavaScript files

If JavaScript files are nested in a subdirectory, like the above example, specify that directory with:

$ nosetests --with-javascript --js-test-dir javascript/fudge/tests/ --js-test-dir ./another/dir

nosejs JavaScript namespace

All scripts have the nosejs JavaScript namespace available for use. The following methods are available:

  • nosejs.requireFile(path)

    • Load a JavaScript file from your test script. If you require the same file multiple times, it will only be loaded once. If the file does not start with a slash, then it should be a path relative to the directory of the script where requireFile() was called from. For example, here is how test_fudge.js requires the fudge library before testing:

      if (nosejs) {
  • nosejs.requireResource(name)

    • Require a JavaScript file that is bundled with NoseJS. There are a few available resources:


      Will load the JQuery library before loading any other tests


      Will load a very minimal set of JavaScript functions for testing. It is a partial implementation of the QUnit test runner interface. Supported methods: module(), test(), equals(), ok(), and expect()

      For example, test_fudge.js uses jquery and the testrunner

      if (nosejs) {

Using the DOM

If your JavaScript under test relies on a browser-like DOM environment, it might work :) Just run:

$ nosetests --with-javascript --with-dom

This will load John Resig's env.js script to simulate a DOM before loading any other JavaScript. There are a few patches that are marked with @nosejs in the NoseJS source.


Currently if JavaScript tests fail, nosetests will not indicate failure. I can't figure out a clean way to do this. Please get in touch if you'd like to help. In general, JavaScript tests are not very well integrated into Nose.


Please submit bugs and patches. All contributors will be acknowledged. Thanks!