Dig Dug. A simple abstraction library for downloading and launching WebDriver service tunnels.

Usage no npm install needed!

<script type="module">
  import digdug from 'https://cdn.skypack.dev/digdug';


Dig Dug


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Dig Dug is a simple abstraction library for downloading and launching WebDriver service tunnels and interacting with the REST APIs of these services.

Dig Dug can run a local Selenium server, and it supports the following cloud testing services:


In many cases, the only configuration you'll need to do to create a tunnel is provide authentication data. This can be provided by setting properties on tunnels or via environment variables. The tunnels use the following environment variables:

Tunnel class Environment variables
CrossBrowserTestingTunnel CBT_USERNAME, CBT_APIKEY

Other properties, such as the local port the tunnel should serve on or the URL of a proxy server the tunnel should go through, can be passed to a tunnel constructor or set on a tunnel instance. See the pages for Tunnel and the tunnel subclasses for available properties.


To create a new tunnel, import the desired tunnel class, create a new instance, and call its start method. start returns a Promise that resolves when the tunnel has successfully started. For example, to create a new Sauce Labs tunnel:

var SauceLabsTunnel = require('digdug/SauceLabsTunnel');
var tunnel = new SauceLabsTunnel();
tunnel.start().then(function () {
    // interact with the WebDriver server at tunnel.clientUrl

Once a tunnel has been started, a test runner interacts with it as described in the service's documentation. The Sauce Labs and TestingBot executables start a WebDriver server on localhost that the test client communicates with. To interact with BrowserStack, a test client will connect to hub.browserstack.com after the tunnel has started.

The tunnel classes also provide a sendJobState convenience method to let the remote service know whether a test session passed or failed. This method accepts a session ID and an object containing service-specific data, and it returns a Promise that resolves if the job state was successfully updated.

tunnel.sendJobState(sessionId, { success: true });

When testing is finished, call the tunnel's stop method to cleanly shut it down. This method returns a Promise that is resolved when the service tunnel executable has exited.

tunnel.stop().then(function () {
    // the tunnel has been shut down


Dig Dug includes a utility script, digdugEnvironmnents. After the digdug package has been installed, run this script to get a list of environments provided by a particular testing service.

$ ./node_modules/.bin/digdugEnvironments SauceLabsTunnel
{"platform":"OS X 10.9","browserName":"firefox","version":"4"}
{"platform":"OS X 10.9","browserName":"firefox","version":"5"}
{"platform":"OS X 10.9","browserName":"firefox","version":"6"}
{"platform":"OS X 10.9","browserName":"firefox","version":"7"}
{"platform":"OS X 10.9","browserName":"firefox","version":"8"}
{"platform":"OS X 10.9","browserName":"firefox","version":"9"}
{"platform":"OS X 10.9","browserName":"firefox","version":"10"}

Note that BrowserStackTunnel requires that the BROWSERSTACK_ACCESS_KEY and BROWSERSTACK_USERNAME environment variables exist and are set to a user's account access key and username. The other tunnels do not (currently) require authentication to request an environment list.

API documentation

View API documentation


Dig Dug is a JS Foundation project offered under the New BSD license.

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