require "minitest/autorun"

require 'bulk_discount.rb'

class BulkDiscountTest < Minitest::Test
  def test_appropriate_discount_is_applied
    unit_discount = 0.75

    discount = BulkDiscount.new(unit_discount: unit_discount, trigger_quantity: 4)

    assert_equal 0.00, discount.discount_for_quantity(3)
    assert_equal unit_discount * 4, discount.discount_for_quantity(4)
    assert_equal unit_discount * 5, discount.discount_for_quantity(5)
  end
end