86 lines
2.2 KiB
Ruby
86 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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require File.expand_path("../helper", __FILE__)
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class TestLinkedList < Rake::TestCase
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include Rake
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def test_empty_list
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empty = LinkedList::EMPTY
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assert empty.empty?, "should be empty"
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end
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def test_list_with_one_item
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list = LinkedList.make(:one)
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assert ! list.empty?, "should not be empty"
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assert_equal :one, list.head
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assert_equal LinkedList::EMPTY, list.tail
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end
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def test_make_with_no_arguments
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empty = LinkedList.make()
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assert_equal LinkedList::EMPTY, empty
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end
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def test_make_with_one_argument
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list = LinkedList.make(:one)
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assert ! list.empty?
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assert_equal :one, list.head
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assert_equal LinkedList::EMPTY, list.tail
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end
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def test_make_with_two_arguments
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list = LinkedList.make(:one, :two)
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assert ! list.empty?
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assert_equal :one, list.head
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assert_equal :two, list.tail.head
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assert_equal LinkedList::EMPTY, list.tail.tail
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end
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def test_list_with_several_items
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list = LinkedList.make(:one, :two, :three)
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assert ! list.empty?, "should not be empty"
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assert_equal :one, list.head
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assert_equal :two, list.tail.head
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assert_equal :three, list.tail.tail.head
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assert_equal LinkedList::EMPTY, list.tail.tail.tail
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end
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def test_lists_are_structurally_equivalent
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list = LinkedList.make(1, 2, 3)
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same = LinkedList.make(1, 2, 3)
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diff = LinkedList.make(1, 2, 4)
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short = LinkedList.make(1, 2)
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assert_equal list, same
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refute_equal list, diff
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refute_equal list, short
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refute_equal short, list
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end
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def test_conversion_to_string
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list = LinkedList.make(:one, :two, :three)
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assert_equal "LL(one, two, three)", list.to_s
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assert_equal "LL()", LinkedList.make().to_s
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end
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def test_conversion_with_inspect
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list = LinkedList.make(:one, :two, :three)
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assert_equal "LL(:one, :two, :three)", list.inspect
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assert_equal "LL()", LinkedList.make().inspect
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end
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def test_lists_are_enumerable
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list = LinkedList.make(1, 2, 3)
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new_list = list.map { |item| item + 10 }
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expected = [11, 12, 13]
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assert_equal expected, new_list
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end
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def test_conjunction
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list = LinkedList.make.conj("C").conj("B").conj("A")
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assert_equal LinkedList.make("A", "B", "C"), list
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end
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end
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