Define order and basket classes

lib/basket.rb

@@ -0,0 +1,8 @@
+# Basket class
+class Basket
+  attr_reader :current_order
+
+  def initialize
+    @current_order = nil
+  end
+end

lib/order.rb

@@ -0,0 +1,9 @@
+# Order class
+class Order
+  attr_reader :items, :basket
+
+  def initialize(basket)
+    @items = []
+    @basket = basket
+  end
+end

spec/basket_spec.rb

@@ -0,0 +1,13 @@
+require 'rspec'
+require 'spec_helper'
+require './lib/basket'
+
+describe Basket do
+  describe '#initialize' do
+    it 'should have a current_order attribute which is a nil' do
+      instance = Basket.new
+
+      expect(instance.current_order).to be_nil
+    end
+  end
+end

spec/order_spec.rb

@@ -0,0 +1,20 @@
+require 'rspec'
+require 'spec_helper'
+require './lib/order'
+
+describe Order do
+  describe '#initialize' do
+    it 'should have a items attribute which is an empty Array' do
+      instance = Order.new(Basket.new)
+
+      expect(instance.items).to be_a Array
+      expect(instance.items).to be_empty
+    end
+
+    it 'should have a basket attribute which is an instance of Basket' do
+      instance = Order.new(Basket.new)
+
+      expect(instance.basket).to be_a Basket
+    end
+  end
+end