What are Selenium tests?
With the release of Liferay 4.4.0 came a slew of bundled Selenium tests. Selenium tests are a tool used for automated regressive testing. You can use Selenium to write scripts that will simulate typical use cases that test Liferay functionality. In layman’s terms, Selenium clicks through windows and types in data as if it were a user. A typical use case would be to deploy whatever new feature you may have developed then running a test suite of Selenium tests to ensure that whatever fixes or features deployed are not inadvertantly breaking other areas.