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0.4.1 • Public • Published

Selenium Sauce

Codeship Status for alexbrombal/selenium-sauce

Coverage Status Codeship Dependencies Dev Dependencies

Easily run your Selenium tests on SauceLabs using Node.js.

Quick Start

Install & add environment variables:

$ npm install selenium-sauce
export SAUCE_USERNAME=******
export SAUCE_ACCESS_KEY=******

Create a test:


var SeSauce = require('selenium-sauce');
// Loads the config file and invokes the callback once for each browser
new SeSauce(
    {   // Configuration options
        webdriver: {            // Options for Selenium WebDriver (WebdriverIO)
            sauce: {
                desiredCapabilities: [{
                    browserName: 'chrome',
                    version: '27',
                    platform: 'XP',
                    tags: ['examples'],
                    name: 'This is an example test'
            local: {
                desiredCapabilities: [{
                    browserName: 'phantomjs'
        httpServer: {           // Options for local http server (
            port: 8080
    function(browser) {
        // Initialize the browser
        browser.init(function(err) {
            if(err) throw err;
            // Load a url into the browser
            browser.url('http://localhost:8080/test.html', function() {
                // Tell SauceLabs that the test was successful
                browser.passed(true, myCompletionCallback);


$ node test.js


This Node.js utility is a wrapper API around a set of technologies that run Selenium tests on SauceLabs. In addition, the tests will run locally if SauceLabs info is not provided.

Running Selenium tests on SauceLabs is not incredibly difficult, but there are a lot of moving parts:

  • SauceLabs has an API for managing jobs and running browsers
  • SauceLabs' instances function as Selenium servers with their own set of APIs
  • Browsers on SauceLabs need access to load webpages from the same machine running the tests, which is done using Sauce Connect to establish a private network tunnel.

On top of that, developing and testing locally requires a local Selenium server, and the SauceLabs features listed above need to be bypassed for that.

Selenium Sauce provides a simple API that encapsulates all of these features, by reusing existing tools and orchestrating their functionality. Each of these utilities are transparently exposed through the Selenium Sauce interface and you can work directly with them. The configuration file values are passed directly into each respective utility (with the exceptions clearly marked here in the documentation and example files). See the list of Components below for more information on the tools that Selenium Sauce comprises.

What Selenium Sauce is not

Selenium Sauce is not a unit test runner or framework. It is meant to be used in conjunction with one, however. Selenium Sauce simply provides an easy way for your tests to connect to Sauce Labs and perform actions—it is up to you to determine whether the actions were successful, and pass or fail your tests accordingly.

See the examples for a sample of how to use this with a unit test utility.


As mentioned in the quick start, you need to install this package with npm. This is not a command-line utility, but rather a programmatic interface that you use in your unit test or other Node.js files.

$ npm install selenium-sauce

require()ing this module in your JavaScript file will return a constructor that you can use to initialize Selenium Sauce instances.

var SeSauce = require('selenium-sauce');

The constructor accepts two parameters: a configuration object, and a callback method that is invoked once for each browser.

The configuration object is mostly just a collection of other configuration objects used to initialize the various components that Selenium Sauce comprises. All of the objects are passed as-is to their respective components, with the exceptions noted below.

The second parameter is the callback method which is executed once for each browser that you configure in the webdriver.desiredCapabilities configuration object. If you are creating unit tests, for example, you would define your test fixtures within this callback so that they run once in each browser.

new SeSauce(
        /* ... configuration object ... */
    function(browser) {
        // function executes once for each browser

The browser object that is passed into the callback is the return value of WebdriverIO's webdriverio.remote() method. It provides all the Selenium API calls that are documented on the WebdriverIO website, with some slight modifications:

  • The browser.init() method is slightly modified to allow Selenium Sauce to initialize the first time it is called. You don't need to change anything about how you call it, but you must call this method to begin making Selenium API calls.
  • The browser.end() method is also slightly modified to allow Selenium Sauce to shut down properly when all browsers have been ended. Again, you don't need to do anything differently, but you must call this method when you are finished with the browser in order to properly shut down the various services that are running.
  • A new method browser.updateJob(data, onComplete) has been added to the browser object. It is simply a wrapper for SauceLabs updateJob method. It reports data to SauceLabs about the current job, but only if SauceLabs is configured. data is an object as described on SauceLabs API documentation. onComplete is executed when the call is finished.
  • A new method browser.passed(passed, onComplete) has been added to the browser object. It is another wrapper around SauceLabs updateJob method, simply allowing you to report the pass/fail result of the test to SauceLabs. passed is a boolean indicating pass (true) or fail (false), and the onComplete callback is executed when the reporting process is complete. browser.passed automatically calls end() when it finishes, so you must not call both passed() and end().

Within the browser callback method, this refers to the Selenium Sauce instance. Through this instance, you can access the following properties:

  • this.webdriver - The wrapper around the Selenium WebDriver protocol. You probably won't need to use this object directly, but instead use the browser object that is passed to the "each browser" callback.
  • this.sauceLabs - The wrapper around the Sauce Labs REST API.
  • this.httpServer - The instance of http-server that is started by SauceLabs in order for Sauce Connect to load pages on your local machine.
  • this.sauceConnect - The Sauce Connect child process object.
  • this.selenium - This is the Selenium Standalone child process object.


The first parameter to the SeSauce constructor is the configuration object. Each property of this configuration object is passed as-is to its respective component (with the exceptions noted here). For details about each component's configuration sub-object, see the provided link to the documentation.


  • quiet: - If true, tells Selenium Sauce to silence its console output.

  • sauceUsername - The username for SauceLabs. Defaults to process.env.SAUCE_USERNAME. This value is used to populate webdriver.sauce.user, sauceLabs.username, and sauceConnect.username; however, you may override those values individually if desired.

  • sauceAccessKey - The access key for SauceLabs. Defaults to process.env.SAUCE_ACCESS_KEY. This value is used to populate webdriver.sauce.key, sauceLabs.password, and sauceConnect.accessKey; however, you may override those values individually if desired.

  • webdriver: - Options for WebdriverIO. This object has two properties, sauce and local, which are used to connect to SauceLabs or a local Selenium instance, respectively.

    • sauce: - This object is passed directly to WebdriverIO only if the user and key properties are valid.

      • user: - The username for SauceLabs. Defaults to the value of sauceUsername (i.e. you do not have to specify this if you already specified sauceUsername).

      • key: - The access key for SauceLabs. Defaults to the value of sauceAccessKey (i.e. you do not have to specify this if you already specified sauceAccessKey).

      • desiredCapabilities: - Non-standard option: an array of desired browser capabilities. This differs from the standard option in that it is an array of browser capabilities rather than a single instance.

    • local: - These options are passed directly to WebdriverIO if the user/key information above is empty.

      • desiredCapabilities: - Same as above. Allows you to specify different browser capabilities when running Selenium locally.
  • httpServer: - Options for HttpServer. These options are passed directly into httpserver.createServer().

    • port - Non-standard option: passed into HttpServer's listen function as the port on which to listen.
  • sauceLabs: - Options for SauceLabs. These options are passed directly into the SauceLabs() constructor.

  • sauceConnect: - Options for Sauce Connect Launcher. These options are passed directly into the SauceConnectLauncher() constructor.

  • selenium: - Options for Selenium Standalone.

    • args: - Array of strings. Passed as the second argument to the selenium() constructor (which are subsequently passed as the command-line arguments to java -jar selenium-server-standalone-X.XX.X.jar)



Selenium Sauce comprises a set of tools that are made transparently available through properties of the Selenium Sauce object. You may use these objects just as you would use the original tools, so take a look at each component's original documentation for details.

  • #### WebdriverIO


    This is the API wrapper around the Selenium WebDriver protocol. You probably don't want to use this object directly, but instead use the browser object that is passed to the doEachBrowser callback.

  • #### SauceLabs


    SauceLabs has their own set of APIs (independent of Selenium) that allow you to query for job IDs or update jobs. Selenium Sauce does not actually use these APIs, but provides it to you for convenience—for example, to set the current job's pass/fail status. You're welcome!

  • #### HttpServer


    It's possible the tests you want to run are in HTML files that only exist on your machine, and not on a publicly-accessible web server. HttpServer is a simple, minimal configuration web server that runs on your local machine to provide browsers access to these test web pages.

  • #### Sauce Connect Launcher


    SauceLabs provides a secure tunnel (called Sauce Connect) between itself and your machine so that SauceLabs' browsers can load webpages that reside on your local machine. This is a Node.js wrapper around the Sauce Connect client.

  • #### Selenium Standalone


    Runs a Selenium Server on your local machine. This is useful for development and is only used if SauceLabs is disabled.


Selenium Sauce is not a unit test runner and has no dependencies on a specific unit test framework, but functions best in conjunction with one. Check out the examples using real test frameworks in the /examples directory (see the README file there for information on how to run the tests).


npm i selenium-sauce

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