Archie Martin

lib/menu.rb

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+class Menu
+
+  attr_reader :dishes
+
+  def initialize(dishes)
+    @dishes = dishes
+  end
+
+  def print_menu
+    dishes.map { |item, price| "%s: £%.2f" % [item.capitalize, price]}.join(', ')
+  end
+
+  def has_dish?(dish)
+    !dishes[dish].nil?
+  end
+
+  def price(dish)
+    dishes[dish]
+  end
+
+end

lib/order.rb

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+class Order
+
+  attr_reader :dishes
+
+  def initialize(menu)
+    @dishes = {}
+    @menu = menu
+  end
+
+  def add(dish, quantity)
+    fail NoItemError, "#{dish.capitalize} is not on the menu!" unless @menu.has_dish?(dish)
+    dishes[dish] = quantity
+  end
+
+  def total
+    item_totals.reduce(:+)
+  end
+
+  private
+
+  def item_totals
+    dishes.map { |dish, quantity| @menu.price(dish) * quantity}
+  end
+end
+
+class NoItemError < StandardError; end

lib/takeaway.rb

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+class TakeAway
+
+def initialize(menu:, order: nil)
+  @menu = menu
+  @order = order || Order.new
+end
+
+def view_menu
+  menu.print
+end
+
+def place_order(dishes)
+  dishes.each { |dish, quantity| order.add(dish, quantity) }
+  order.total
+end
+private
+
+attr_reader :menu, :order
+
+end

runner.rb

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+require './lib/takeaway.rb'
+require './lib/menu.rb'
+require './lib/order.rb'
+require './lib/message.rb'

spec/menu_spec.rb

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+require 'menu'
+
+describe Menu do
+  subject(:menu) { described_class.new(dishes)}
+  let(:dishes) { {
+    "Prawn Toast": 5.5,
+    "Siu Mai": 4.0,
+    "Singapore Vermicelli": 6.6
+  } }
+  it 'contains a list of dishes with prices' do
+    expect(menu.dishes).to eq(dishes)
+  end
+
+  it "prints a list of dishes with prices" do
+    printed_menu = "Prawn toast: £5.50, Siu mai: £4.00, Singapore vermicelli: £6.60"
+    expect(menu.print_menu).to eq(printed_menu)
+  end
+
+  it 'tells if a dish is on the menu' do
+    expect(menu.has_dish?(:"Prawn Toast")).to be true
+  end
+
+  it 'claculates a price' do
+    expect(menu.price(:"Prawn Toast")).to eq(dishes[:"Prawn Toast"])
+  end
+end

spec/order_spec.rb

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+require 'order'
+require 'menu'
+
+describe Order do
+  subject(:order) {described_class.new(menu)}
+  let(:menu) {instance_double("Menu")}
+  let(:dishes) {
+    {
+      "Prawn Toast": 2,
+      "Siu Mai": 1
+    }}
+
+  before do
+    allow(menu).to receive(:has_dish?).with(:"Prawn Toast").and_return(true)
+    allow(menu).to receive(:has_dish?).with(:"Siu Mai").and_return(true)
+    allow(menu).to receive(:price).with(:"Prawn Toast").and_return(5.50)
+    allow(menu).to receive(:price).with(:"Siu Mai").and_return(4.00)
+  end
+
+  it "selects several dishes from the menu" do
+    create_order
+    expect(order.dishes).to eq(dishes)
+  end
+
+  it "doesn't allow items to be added that are not on the menu" do
+    allow(menu).to receive(:has_dish?).with(:"Onion Bhaji").and_return(false)
+    expect { order.add(:"Onion Bhaji", 2) }.to raise_error NoItemError, "Onion bhaji is not on the menu!"
+  end
+
+  it "calculates the total of the order" do
+
+    total = 15.00
+    expect(order.total).to eq(total)
+  end
+
+
+
+  def create_order
+    order.add(:"Prawn Toast", 2)
+    order.add(:"Siu Mai", 1)
+  end
+end
+

spec/takeaway_spec.rb

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+require 'takeaway'
+require 'order'
+
+describe TakeAway do
+
+  subject(:takeaway) { described_class.new(menu: menu, order: order) }
+
+  let(:menu) {double(:menu, print: printed_menu)}
+  let(:order) {instance_double("Order", total: 15.60)}
+
+  let(:printed_menu) { "Prawn Toast: £5.50"}
+
+  let(:dishes) { {
+    "Prawn Toast": 1,
+    "Siu Mai": 2,
+  } }
+
+  it "can create an instance of itself" do
+    expect(subject).to be_kind_of(TakeAway)
+  end
+
+  it "can print a list of dishes and prices" do
+    expect(takeaway.view_menu).to eq (printed_menu)
+  end
+
+  it "can order some number of several available dishes" do
+    allow(order).to receive(:add).twice
+    expect(takeaway.place_order(dishes)).to eq(dishes)
+  end
+
+  it "knows the order total" do
+    allow(order).to receive(:add)
+    total = takeaway.place_order(dishes)
+    expect(total).to eq(15.60)
+  end
+end