rspec mock/stub example

gistfile1.rb

describe Order do
  describe "#sub_total" do
    # writing everything to db
    it "should calculate the sum of all of its shop_items" do
      order = Order.create(some_options)
      3.times do
        order.shop_items << ShopItem.create(:price => 2.00)
      end
      order.subtotal.should be_within(0.01).of(6.0)
    end
    #  mocking
    it "should calculate the sum of all of its shop_items" do
      order = Order.create(some_options)
      fake_items = [stub(:price => 2.00), stub(:price => 2.00), stub(:price => 2.00)]
      order.stub!(:shop_items).and_return(fake_items)
      order.subtotal.should be_within(0.01).of(6.0)
    end
  end
end