Dave Hoover demonstrates how to use Watir with Cucumber. Actually, he uses his own library SafariWatir, but you could easily swap it with Watir, FireWatir, ChromeWatir or Celerity. Cucumber lets software development teams describe how software should behave in plain text. The text is written in a business-readable domain-specific language and serves as documentation, automated tests and development-aid – all rolled into one format. Â Sorry – no sound.