Question about stubbing vs. mocking, https://twitter.com/#!/sumeet_agarwal/status/168580318620688384

gistfile1.rb

describe MyClass do
  it "retrieves data from the data store" do
    data = stub
    # should_receive would be redundant here because the assertion confirms
    # data was passed through.
    DataStore.stub!(:find_data).and_return(data)
    subject.data.should == data
  end

  it "sends an email to the user" do
    email_address = stub
    # should_receive is necessary here because we're not looking for data to
    # be passed through.
    Welcomer.should_receive(:send_welcome_email).with(email_address)
    subject.add_user(email_address)
  end
end