require 'test/unit' class TestEnumerator < Test::Unit::TestCase def setup @obj = Object.new class << @obj include Enumerable def foo(*a) a.each {|x| yield x } end end end def enum_test obj i = 0 obj.map{|e| e }.sort end def test_iterators assert_equal [0, 1, 2], enum_test(3.times) assert_equal [:x, :y, :z], enum_test([:x, :y, :z].each) assert_equal [[:x, 1], [:y, 2]], enum_test({:x=>1, :y=>2}) end ## Enumerator as Iterator def test_next e = 3.times 3.times{|i| assert_equal i, e.next } assert_raise(StopIteration){e.next} end def test_loop e = 3.times i = 0 loop{ assert_equal(i, e.next) i += 1 } end def test_nested_itaration def (o = Object.new).each yield :ok1 yield [:ok2, :x].each.next end e = o.to_enum assert_equal :ok1, e.next assert_equal :ok2, e.next assert_raise(StopIteration){e.next} end def test_initialize assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).to_a) assert_equal([1, 2, 3], Enumerable::Enumerator.new(@obj, :foo, 1, 2, 3).to_a) assert_raise(ArgumentError) { Enumerable::Enumerator.new } end def test_initialize_copy assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).dup.to_a) e = @obj.to_enum(:foo, 1, 2, 3) assert_nothing_raised { assert_equal(1, e.next) } assert_raise(TypeError) { e.dup } end def test_gc assert_nothing_raised do 1.times do foo = [1,2,3].to_enum GC.start end GC.start end end def test_slice assert_equal([[1,2,3],[4,5,6],[7,8,9],[10]], (1..10).each_slice(3).to_a) end def test_cons a = [[1,2,3], [2,3,4], [3,4,5], [4,5,6], [5,6,7], [6,7,8], [7,8,9], [8,9,10]] assert_equal(a, (1..10).each_cons(3).to_a) end def test_with_index assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).with_index.to_a) end def test_with_memo r = 1..10 assert_equal([55, 3628800], (1..10).each.with_memo([0,1]) {|i, memo| memo[0] += i memo[1] *= i }) a = [2,5,2,1,5,3,4,2,1,0] a.delete_if.with_memo({}) {|i, seen| if seen.key?(i) true else seen[i] = true false end } assert_equal([2, 5, 1, 3, 4, 0], a) end def test_next_rewind e = @obj.to_enum(:foo, 1, 2, 3) assert_equal(1, e.next) assert_equal(2, e.next) e.rewind assert_equal(1, e.next) assert_equal(2, e.next) assert_equal(3, e.next) assert_raise(StopIteration) { e.next } end end