when_it_refactored.rb

describe Controller do
 before(:each) do
   @model = mock("model").as_null_object
   @view = mock("view").as_null_object
   @controller = Controller.new(@model, @view)
 end

 def act
   @return_value = @controller.act_on(:some_input)
 end

 it "should get data from model" do
   @model.should_receive(:data_for).with(:some_input)
   act
 end

 it "should return :success" do
   act
   @return_value.should == :success
 end
end