Behaviour Driven Development for Ruby
rspec is a meta-gem, which depends on the rspec-core, rspec-expectations
and rspec-mocks gems. Each of these can be installed separately and actived
in isolation with the gem command. Among other benefits, this
allows you to use rspec-expectations, for example, in Test::Unit::TestCase
if you happen to prefer that style.
Conversely, if you like RSpec's approach to declaring example groups
and examples (describe and it) but prefer
Test::Unit assertions and mocha, rr or flexmock for mocking, you'll be
able to do that without having to load the components of rspec that
you're not using.
gem install rspec