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Parallel End to End Testing With Selenium Services

This package provides an example Node.js setup for running parallel end to end Selenium tests using one of these cloud services:

These services each provide an SSH tunnel application that allows cloud Selenium servers to run tests against your local web server, or a web server in your internal network. Since most of the time taken by a test thread is spent waiting on responses from the remote server, it is perfectly feasible to run dozens or even hundreds of parallel end to end tests through a single SSH tunnel on a single developer machine.

When the Selenium tests for a major project usually require hours to run serially, the ability to easily run in parallel is very helpful.


Install the example package via NPM:

npm install selenium-service-example


You will need to obtain a free account with one of the services noted above. This won't take long - it is a painless signup. Once registered you can find the necessary account name, API secret and/or key in your account settings.

Add your newly obtained credentials to the relevant section of config/index.js and set the service property in that file to either browserlab, saucelabs, or testingbot, depending on which service you are using.

A free account grants you access to very little in the way of resources, but it will be sufficient to try out this example of how to set up parallel end to end tests.

Running the Example Tests

Fire up the Vagrant Ubuntu 12.04 VM; it will provision itself with the latest stable Node.js version:

vagrant up
vagrant ssh

Vagrant is used because the SSH tunnel binaries for SauceLabs and BrowserStack require glibc 2.15 or later as of January 2014. If your host machine is CentOS or an older version of another distro then the tunnel won't work locally - but it will in the VM.

Once logged in to the Vagrant VM:

cd /vagrant
node runTests

Assuming the SSH tunnel successfully instantiated - it will occasionally fail, which is the way of all cloud services - then two test runner subprocesses will spawn to run Selenium tests in parallel.

You can look into the log directory to see the output from each test runner process.