David Underwood
92 lines
1.9 KiB
Ruby
92 lines
1.9 KiB
Ruby
require "minitest/autorun"
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require "./checkout.rb"
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class TestCheckout < Minitest::Test
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def setup
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@checkout = Checkout.new
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end
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def test_that_unknown_items_cannot_be_added
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assert_raises Checkout::InvalidItem do
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@checkout.add(:foo)
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end
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end
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def test_that_allowed_items_are_added
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@checkout.add(:PI5)
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@checkout.add(:ZERO2W)
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@checkout.add(:PICO2)
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assert_equal [:PI5, :ZERO2W, :PICO2].sort, @checkout.items.sort
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end
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def test_that_total_is_the_sum_of_all_items_when_no_discounts_apply
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@checkout.add(:PI5) # 60.00
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@checkout.add(:ZERO2W) # 15.00
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@checkout.add(:PICO2) # 4.00
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# -----
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# 79.00 total
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assert_equal 79.00, @checkout.total
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end
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def test_that_an_empty_checkout_total_is_zero
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assert_equal 0.00, @checkout.total
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end
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# Discounts
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def test_that_bogof_applied
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4.times do
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@checkout.add(:ZERO2W) # Should remove 2 Zeros
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end
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assert_equal 30.00, @checkout.total
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end
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def test_that_bogof_applied_with_odd_number
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5.times do
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@checkout.add(:ZERO2W) # Should still remove 2 Zeros, 5th is full price
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end
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assert_equal 45.00, @checkout.total
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end
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def test_that_price_is_reduced_for_3_picos
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3.times do
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@checkout.add(:PICO2) # 3.50 * 3 = 10.50
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end
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assert_equal 10.50, @checkout.total
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end
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def test_that_price_is_reduced_for_more_than_3_picos
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4.times do
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@checkout.add(:PICO2) # 3.50 * 4 = 14
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end
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assert_equal 14.00, @checkout.total
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end
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def test_that_price_is_not_reduced_for_less_than_3_picos
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2.times do
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@checkout.add(:PICO2)
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end
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assert_equal 8.00, @checkout.total
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end
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def test_that_both_discounts_apply_at_the_same_time
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4.times do
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@checkout.add(:ZERO2W) # 30.00 total
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end
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3.times do
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@checkout.add(:PICO2) # 10.50 total
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end
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assert_equal (30.00 + 10.50), @checkout.total
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end
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end
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