Watir 介绍
Watir 是一个使用 Ruby 实现的开源Web 自动化测试框架，相对于那些庞大的商业工具来说，它很小巧，也很灵活，提供的功能也足够用。
Watir is an open-source library for automating web browsers. It allows you to
write tests that are easy to read and maintain. It is simple and flexible.
Watir drives browsers the same way people do. It clicks links, fills in forms,
presses buttons. Watir also checks results, such as whether expected text
appears on the page.
Watir is a family of Ruby libraries. They support Internet Explorer on
Windows, Firefox on Windows, Mac and Linux, and Safari on Mac.