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Selenium is one of the most widely used and trusted open source automation tools in the world. It is also known as the “Swiss Army knife” of automation testing tools, as it can be used to automate a broad range of testing processes, such as interface tests, regression tests, user stories, etc. Selenium’s application field and working principle are briefly introduced in this article.

Selenium is mainly used for automated web application testing. The software can be used to test the functions of web pages, its usability, compatibility, etc., in order to find bugs and fix them in time. Its core function is to simulate the operations in web UI, and save the records of the operation process, so that the tester can use the records to replay them when debugging. Selenium can also be used for non-functional testing, such as load impact testing, performance impact testing, etc. In addition, it can also be used for mobile device testing.

The core of Selenium is the WebDriver API, which can be used to open a browser window and have the ability to simulate page operations. WebDriver supports a series of APIs used to control the browser, such as scrolling, clicking, switching windows, locating elements, etc. WebDriver can also check the page content, get JavaScript error information, get screenshots of the page, etc. In addition, since version 3.0, WebDriver also supports automated UI testing of native mobile applications.

In addition to the WebDriver API, Selenium also provides a set of library API called Selenium Remote Control (RC), which can be used to write user scripts and story files. Selenium RC can control the operation of browser, but it can’t manipulate the page content, it can only get the HTML code of the page and detect whether the operation is successful. Therefore, it is mainly used for functional testing.

Last but not least, Selenium also provides a set of development tools, including IDE, Grid and Selenese. The IDE can be used to edit WebDriver APIs, Grid can be used to distribute tasks, and Selenese can be used to write story files. In addition, there are many language bindings that can be used to control Selenium, such as Java, Python, C#, PHP, Ruby, JavaScript. With these tools, problems related to automation testing can be solved easily.

To sum up, Selenium is a powerful automation testing tool, with a wide range of application and easy-to-use features. It can be used for web application testing, non-functional testing and mobile device testing. With its powerful WebDriver API, library API and development tools, Selenium can help testers to conduct automated testing quickly and efficiently.

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