Created in 2005, Rspec is a testing framework for behavior-driven development (BDD) for Ruby. It allows you to conduct Unit, Functional, and Feature tests. RSpec is composed of multiple libraries, which are designed to work together, or can be used independently with other testing tools like Cucumber or Minitest. It is one of the most frequently used testing libraries for Ruby in production applications.
Rspec features a simple syntax that reads more like English than your typical code. Like all Ruby related tools, it is available in the form of the RSpec Ruby gem, which makes it easy to install.