When adding support to the driver class for third-party grids such as Sauce Labs or Perfecto Mobile, users must add conditions in the driver class that set specific preferences, credentials, URLs, and so on, to direct traffic to that test platform. They are really just other Selenium grids to run against in the cloud, which free up the tester from all the maintenance requirements of an in-house grid. The condition to run on one of these third-party platforms can be passed as a parameter to the test, specifically environment. For instance, here is an example of a TestNG XML file using parameters to set up the driver:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">

<suite name="My Test Suite" preserve-order="true" parallel="false" thread-count="1" verbose="2">

<!-- suite parameters -->
    <!-- "local", "remote", "saucelabs" -->
    <parameter name="environment" value="saucelabs" />

    <test name="My Feature Test">
        <!-- test parameters -->
        <parameter name="browser" value="chrome" />
        <parameter name="platform" value="Windows 10" />

        or

        <parameter name="browser" value="iphone"/>
        <parameter name="platform" value="iphone"/>

        <classes>
            <class name="com.myproject.MyTest" />
        </classes>
    </test>
</suite>

Each provider will require a different RemoteWebDriver URL, credentials to access their test cloud, preferences, and various other features that would allow access to a DMZ inside a corporate Firewall. Here are some examples of specific Sauce Labs Cloud platform requirements:

// third party preferences for SauceLabs...

if ( environment.equalsIgnoreCase("saucelabs") ) {
    // setup the Selenium Grid capabilities...
    String remoteHubURL =  
           "http://SAUCE_USERNAME:SAUCE_ACCESS_KEY
           @ondemand.saucelabs.com:80/wd/hub";

    caps.setCapability("screenResolution",
                       "1920x1080");
    caps.setCapability("recordVideo",
                        false);
    caps.setCapability("tunnelIdentifier",
                        System.getProperty("TUNNEL_IDENTIFIER"));
   ...
}