RSpec is a Behaviour Driven Development framework with tools to express User Stories with Executable Scenarios and Executable Examples at the code level.
RSpec ships with several modules:
Spec::Story provides a framework for expressing User Stories and Scenarios
Spec::Example provides a framework for expressing Isolated Examples
Spec::Expectations supports setting expectations on your objects so you can do things like:
Spec::Mocks supports creating Mock Objects, Stubs, and adding Mock/Stub behaviour to your existing objects.
The simplest approach is to install the gem (as root in some environments):
gem install -r rspec
Building the RSpec gem
If you prefer to build the gem locally:
git clone git://github.com/dchelimsky/rspec.git cd rspec rake gem gem install pkg/rspec-0.x.x.gem #as root