HTMLUnitDriver Extra cover

HTMLUnitDriver is the fastest implementation of WebDriver. It is a java based implementation of a Web Browser without a GUI. For any language binding (other than java) the Selenium Server is required to use this driver. It supports JavaScript. JavaScript engine used by the HTMLUnit (Rhino) is different from other popular browsers. Testing JavaScript using HTMLUnit differ significantly with results.

Note:
Download the latest Selenium drivers[2.35 or above];  Older versions of Selenium won't work.

Handle Transparent Proxy 

HtmlUnitDriver driver = new HtmlUnitDriver();    
driver.setProxy("xxx.xxx.xxx.xxx", port);    //  set proxy for handling Transparent Proxy
driver.setJavascriptEnabled(true);    //  enable JavaScript [this emulate IE's js by default]


Emulate popular Browser's JS

HtmlUnitDriver driver = new HtmlUnitDriver(BrowserVersion.FIREFOX_17);
driver.setJavascriptEnabled(true);


Emulate specific Browser's JS using Capabilities

#1
DesiredCapabilities capabilities = DesiredCapabilities.htmlUnit();
driver = new HtmlUnitDriver(capabilities);
#2
DesiredCapabilities capabilities = DesiredCapabilities.firefox();  
capabilities.setBrowserName("Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Firefox/24.0");
capabilities.setVersion("24.0");
driver = new HtmlUnitDriver(capabilities);