Develop acceptance tests & end-to-end tests with realtime feedback.


An awesome developer-centric experience to writing tests with realtime feedbackusing Mocha, Jasmine or Cucumber.js.

Chimp can be used with any technology stackas it allows your to write your test automation in the language of the web: JavaScript.

Realtime feedback?

Traditionally only available for unit testing, and now you can get super fast feedback for your acceptance and end-to-end tests:

Set an @focustag in the spec title, save a file, Chimp reruns the spec until you make it pass.

Want to be a Chimp Ninja?

Checkout our new book where you can learn how to use Chimp across the Full Stack from React to Node.JS, Mocha, Meteor and more.

Quality Fasterby Sam Hatoum, creator of Chimp.

Installation as cli

npm install -g chimp

Be sure to checkout our Automated Testing Best Practicesrepository.

Having trouble? See the installation documentation.

Usage as cli

For development mode, you can use the watch mode:

chimp --watch

You can also easily change the browser Chimp with --browser, e.g. --browser=phantomjs

Installation as gulp/grunt module

npm install chimp

Usage in a gulp task

let Chimp = require('chimp');
let options = require('./my/config/for/chimp');
options['_'] = [
let chimp = new Chimp(options);
chimp.run(function (err, res) {
    console.log('CHIMP RES:',res);
    console.log('CHIMP ERR:',err);
    //next action after chimp finish


Read the full documentation site.

(Thank you to Readme.iofor the OSS <3)

Additional Features

Synchronous Javascript

We chose WebdriverIOfor it's awesome API and made it awesomer by converting it to a synchronous syntax:

browser.url('http://google.com'); // SETUP

var title = browser.getTitle();   // EXECUTE

expect(title).to.equal('Google'); // VERIFY

No callback-hell or confusing assertions with promises, just easy-to-read synchronous code that works as you expect it to.

Easy CI

Chimp is tested on all the popular CI servers. We genuinely just want you to focus on writing tests and let us deal with all the boring bits!

Mocha, Jasmine or Cucumber.js

Some developers love Jasmine and Mocha, and some teams love to use Cucumber for BDD. We decided to give you the choice between the best in class test frameworks for writing end-to-end and acceptance tests.

Client & Server

End-to-end and acceptance testing often require you to setup data on the server and reset state between specs.

Chimp exposes a global function called requestthat is a synchronous version of the popular request module. Our synchronous version of the request module allows you to call your server to reset your system or setup data and receive a result back synchronously, like this:

var userId = request({
  url: 'http://localhost:3000/fixtures/createUser'
  method: 'POST',
  json: true,
  body: {username: 'Bob', password: 't0ps3cret'}

Or if you are using Meteor, you can get fancy with our server.executemethod:

var privateSetting = server.execute(function(settingKey) {
  return Meteor.settings[settingKey];
}, 'privateSetting')
Lots more

Chimp is PACKED with features that make your life easier. See the documentation sitefor more details.

Using Meteor?

Chimp comes with first-grade Meteor support out-of-the-box, including hot-deploy detection that runs specs after your Meteor client or server restart.

Be sure to checkout our Automated Testing Best Practicesrepository which is written using Meteor.


In development mode, use the watch mode:

# start your Meteor app first
chimp --watch --ddp=http://localhost:3000

On CI, can select the browser:

# start your Meteor app first
chimp --browser=firefox --ddp=http://localhost:3000

Multiple Meteor Servers

If you'd like to run a test with more than one Meteor app server, you can do so by running the same app on multiple ports and providing mulitple -ddpoptions to chimp:

# start first app
meteor --port 3005

# start second app in another shell 
meteor --port 3007

# run chimp in another shell
chimp --watch --ddp=http://localhost:3005 --ddp=http://localhost:3007

Then you can access the servers in your tests on the global server.instancesproperty

it('has PORT env var set', function() {
  function getRootUrl() {
    return process.env.ROOT_URL;


Support us with a monthly donation and help us continue our activities. [Become a backer]


Slack:Join our Slack xolv.io/community#chimp channel, where you can find help and help others.



Become a sponsor and get your logo on our README on Github with a link to your site. [Become a sponsor]





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