checkout_test.rb

require "minitest/autorun"
require_relative 'checkout.rb'

describe Checkout do
  before do
    @checkout = Checkout.new(nil)
  end

  # Items: AM,AC,AM,AM,CA
  # Precio total esperado: 22.45€
  describe "when scan three am" do
    it "must apply 2x1 in am" do
      ["AM", "AC", "AM", "AM", "CA"].each do |item|
        @checkout.scan(item)
      end
      @checkout.total.must_equal 22.45
    end   
  end 

  # Items: AM,AM
  # Precio total esperado: 3.11€

  describe "when scan two am" do
    it "must apply 2x1 in am" do
      ["AM", "AM"].each do |item|
        @checkout.scan(item)
      end
      @checkout.total.must_equal 3.11
    end   
  end

   # Items: AC,AC,AM,AC
   # Precio total esperado: 16.61€
  describe "when scan three ac" do
    it "must apply discount in ac" do
      ["AC", "AC", "AM", "AC"].each do |item|
        @checkout.scan(item)
      end
      @checkout.total.must_equal 16.61
    end   
  end 

   # Items: AC,AC,AM,AM,AC,CA,CA
   # Precio total esperado: 16.61€
  describe "when scan three ac, two am" do
    it "must apply both discounts" do
      ["AC", "AC", "AM", "AM", "AC", "CA", "CA"].each do |item|
        @checkout.scan(item)
      end
      @checkout.total.must_equal 39.07
    end   
  end 
end