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    <p>This is a great question. I'm going to try to break this down into smaller packets of information so that it hopefully makes sense for old pros and newbies alike.</p> <h2><strong>Without Selenium Grid:</strong></h2> <p>For starters, it is possible to use individual drivers for all the different browser/OS combinations you wish to run the tests on. The drawback is you have to make some (though usually minimal) code adjustments for each browser's driver. This also means breaking the <a href="http://en.wikipedia.org/wiki/Don%27t_repeat_yourself" rel="nofollow noreferrer">DRY principle</a>. To learn more about writing these kinds of tests check out <a href="http://www.seleniumhq.org/docs/03_webdriver.jsp#introducing-the-selenium-webdriver-api-by-example" rel="nofollow noreferrer">this documentation</a>. (Also note that if you wanted to run these tests on each build via CI on something like <a href="http://en.wikipedia.org/wiki/Jenkins_%28software%29" rel="nofollow noreferrer">Jenkins</a> you need to have the actual browsers running on a slave on your own hardware, but these are more the <a href="http://en.wikipedia.org/wiki/DevOps" rel="nofollow noreferrer">DevOps</a> concerns.) </p> <h2><strong>Using Selenium Grid:</strong></h2> <p>More commonly used for the sort of goals you mentioned (and referenced in the other post you linked to), Selenium Grid is a server that allows multiple instances of tests to run in different web browsers on remote machines. The more intro oriented docs for this are <a href="https://code.google.com/p/selenium/wiki/Grid2" rel="nofollow noreferrer">here</a> and more forward looking docs are <a href="https://github.com/SeleniumHQ/selenium-docs/blob/master/07_Selenium_Grid.md" rel="nofollow noreferrer">here</a>.</p> <p><strong>Running Local or in the Cloud:</strong> With Selenium Grid you are going to go one of two ways.</p> <ol> <li>Run <a href="https://github.com/SeleniumHQ/selenium-docs/blob/master/07_Selenium_Grid.md#quick-start" rel="nofollow noreferrer">on your own hardware</a> locally (or wherever your company has machines to remote into)</li> <li>Use an <a href="https://stackoverflow.com/questions/4645805/selenium-grid-service">online service</a> like <em>Sauce Labs</em> or <em>Testing Bot</em></li> </ol> <p>A nice "what this might look like in Java" for having an online service provide the browsers is shown in <a href="https://saucelabs.com/docs/ondemand/getting-started/env/java/se2/windows" rel="nofollow noreferrer">this Sauce Labs page</a> and for Testing Bot <a href="http://selenium.polteq.com/en/category/selenium-grid-2/" rel="nofollow noreferrer">here</a>.</p> <p><strong>Selenium Can be Written in a Ton of Languages:</strong> Selenium follows the <a href="http://www.w3.org/TR/2013/WD-webdriver-20130117/" rel="nofollow noreferrer">WebDriver API</a> and for C#, Java, Perl, PHP, Python, Ruby, JavaScript (Node) or other languages, you still can write test scripts in any of these (and they provide the “frameworks” for some of these <a href="http://www.seleniumhq.org/download/" rel="nofollow noreferrer">officially</a>, while others are community driven) and still have the run tests run solidly in all modern browsers. </p> <p><strong>Concerning Mobile Devices</strong> There is some good discussion over <a href="https://stackoverflow.com/questions/18727677/is-selenium-testing-worthwhile-on-mobile-devices">here</a> that discusses how "close to the real thing" you want your mobile browser tests to be, since the <a href="https://code.google.com/p/selenium/wiki/IPhoneDriver" rel="nofollow noreferrer">iPhoneDriver</a> and <a href="https://code.google.com/p/selenium/wiki/AndroidDriver" rel="nofollow noreferrer">AndroidDriver</a> are largely based on use through WebView, which is less close to the real thing. They are now finding themselves being replaced by <a href="http://ios-driver.github.io/ios-driver/" rel="nofollow noreferrer">ios-driver</a>, <a href="http://selendroid.io/" rel="nofollow noreferrer">Selendroid</a>, and <a href="http://appium.io/" rel="nofollow noreferrer">Appium</a>.</p> <h2><strong>To Sum It Up</strong></h2> <p>So to answer what I think you’re getting at with, </p> <blockquote> <p>... is possible to run tests and verify those on the different OS and Browsers just by using the libraries provided by the Selenium</p> </blockquote> <p>the answer is that you can <strong>use Selenium Grid and an online service</strong> or you will have to use base Selenium/Selenium Server <strong>along with a number of other libraries</strong> to test all modern browser and OS combinations, but I'm sure many shops do just that because they have the experience and expertise to pull it off. </p> <hr> <p><strong><em>Alternate (Non-Selenium) Option to Write Once and Test Across Browsers:</strong> If you have a team with JavaScript experience and you're looking to hit the same goal of testing across browsers without the overhead of Selenium, <a href="http://saucelabs.com/javascript/" rel="nofollow noreferrer"> <strong>Automates JavaScript Unit Testing with Sauce Labs</strong> </a> (formerly Browser Swarm) would be a good option.</em></p>
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