RSpec is a Behaviour Driven Development framework for writing executable code examples.
Spec::Example provides a framework for organizing executable code examples
Spec::Expectations adds #should and #should_not to every object
Spec::Matchers provides Expression Matchers for use with #should and #should_not
Spec::Mocks is a full featured mock object/stubbing library
describe Account do context "transfering money" do it "deposits transfer amount to the other account" do source = Account.new(50, :USD) target = mock('target account') target.should_receive(:deposit).with(Money.new(5, :USD)) source.transfer(5, :USD).to(target) end it "reduces its balance by the transfer amount" do source = Account.new(50, :USD) target = stub('target account') source.transfer(5, :USD).to(target) source.balance.should == Money.new(45, :USD) end end end $ spec spec/account_spec.rb --format nested Account transfering money deposits transfer amount to the other account reduces its balance by the transfer amount 2 examples, 0 failures
[sudo] gem install rspec
See wiki.github.com/dchelimsky/rspec if you want to clone/build/install.