require "minitest/autorun"

require "./checkout.rb"

class TestCheckout < Minitest::Test
  def setup
    @checkout = Checkout.new
  end

  def test_that_unknown_items_cannot_be_added
    assert_raises Checkout::InvalidItem do
      @checkout.add(:foo)
    end
  end

  def test_that_allowed_items_are_added
    @checkout.add(:PI5)
    @checkout.add(:ZERO2W)
    @checkout.add(:PICO2)

    assert_equal [:PI5, :ZERO2W, :PICO2].sort, @checkout.items.sort
  end

  def test_that_total_is_the_sum_of_all_items # Not accounting for discounts at the moment
    @checkout.add(:PI5)     # 60.00
    @checkout.add(:ZERO2W)  # 15.00
    @checkout.add(:PICO2)   #  4.00
                            # -----
                            # 79.00 total

    assert_equal 79.00, @checkout.total
  end

  def test_that_an_empty_checkout_total_is_zero
    assert_equal 0.00, @checkout.total
  end
end