The objective of this article was to present the Selenium tool in conjunction with the Java Web program language and the need to use automated tests to ensure a system (software) of quality and reliability, thereby preventing occasional failures, extra expenses, loss of reputation commercial, among other annoying. Nowadays it is still very common for companies to carry out the testing of their systems manually and this can cause numerous problems for companies and customers, who may come to deposit personal information on the website, especially e-commerce systems that in addition of personal information, they also tend to take advantage of addresses and the various forms of online financial transactions. The tests performed in an automated way are faster than manual tests and this tends to decrease the delivery delay of the projects, besides making it easier for the tests to be carried out during the development of the system, thereby reducing the problems that may occur before version which will be made available to the customer or end user.