describe 'Car' do 
  describe "when starting" do 
    before :each do 
      @key = Key.new (or mock if Key.new requires too much setup code) 
      @car = Car.new(@key) 
    end 
 
    it "should insert key" do 
      @key.expects(:insert) 
      @car.start 
    end 
 
    it "should turn key" do 
      @key.expects(:turn) 
      @car.start 
    end 
  end 
end