26 lines
1.0 KiB
Ruby
26 lines
1.0 KiB
Ruby
require "minitest/autorun"
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require 'buy_x_get_one_free_discount.rb'
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class BuyXGetOneFreeDiscountTest < Minitest::Test
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def test_appropriate_discount_is_applied
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unit_price = 4.00
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(2..4).each do |trigger_quantity|
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discount = BuyXGetOneFreeDiscount.new(unit_price: unit_price, trigger_quantity: trigger_quantity)
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# Single discount at and above trigger quantity
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assert_equal unit_price, discount.discount_for_quantity(trigger_quantity)
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assert_equal unit_price, discount.discount_for_quantity(trigger_quantity + 1)
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assert_equal unit_price, discount.discount_for_quantity(trigger_quantity + trigger_quantity - 1)
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# No discount if less than trigger quantity
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assert_equal 0.00, discount.discount_for_quantity(trigger_quantity - 1)
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# Double discount if double trigger quantity
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assert_equal unit_price * 2, discount.discount_for_quantity(trigger_quantity * 2)
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assert_equal unit_price * 2, discount.discount_for_quantity((trigger_quantity * 2) + 1)
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end
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end
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end
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