338 lines
6.9 KiB
Ruby
338 lines
6.9 KiB
Ruby
require 'test/unit'
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class TestEnumerator < Test::Unit::TestCase
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def setup
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@obj = Object.new
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class << @obj
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include Enumerable
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def foo(*a)
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a.each {|x| yield x }
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end
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end
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end
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def enum_test obj
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i = 0
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obj.map{|e|
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e
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}.sort
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end
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def test_iterators
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assert_equal [0, 1, 2], enum_test(3.times)
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assert_equal [:x, :y, :z], enum_test([:x, :y, :z].each)
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assert_equal [[:x, 1], [:y, 2]], enum_test({:x=>1, :y=>2})
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end
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## Enumerator as Iterator
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def test_next
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e = 3.times
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3.times{|i|
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assert_equal i, e.next
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}
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assert_raise(StopIteration){e.next}
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end
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def test_loop
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e = 3.times
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i = 0
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loop{
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assert_equal(i, e.next)
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i += 1
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}
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end
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def test_nested_itaration
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def (o = Object.new).each
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yield :ok1
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yield [:ok2, :x].each.next
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end
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e = o.to_enum
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assert_equal :ok1, e.next
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assert_equal :ok2, e.next
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assert_raise(StopIteration){e.next}
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end
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def test_initialize
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assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).to_a)
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assert_equal([1, 2, 3], Enumerator.new(@obj, :foo, 1, 2, 3).to_a)
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assert_equal([1, 2, 3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.take(3))
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assert_raise(ArgumentError) { Enumerator.new }
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end
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def test_initialize_copy
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assert_equal([1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).dup.to_a)
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e = @obj.to_enum(:foo, 1, 2, 3)
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assert_nothing_raised { assert_equal(1, e.next) }
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assert_raise(TypeError) { e.dup }
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e = Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.dup
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assert_nothing_raised { assert_equal(1, e.next) }
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assert_raise(TypeError) { e.dup }
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end
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def test_gc
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assert_nothing_raised do
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1.times do
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foo = [1,2,3].to_enum
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GC.start
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end
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GC.start
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end
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end
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def test_slice
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assert_equal([[1,2,3],[4,5,6],[7,8,9],[10]], (1..10).each_slice(3).to_a)
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end
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def test_cons
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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]]
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assert_equal(a, (1..10).each_cons(3).to_a)
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end
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def test_with_index
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assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).with_index.to_a)
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assert_equal([[1,5],[2,6],[3,7]], @obj.to_enum(:foo, 1, 2, 3).with_index(5).to_a)
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end
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def test_with_object
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obj = [0, 1]
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ret = (1..10).each.with_object(obj) {|i, memo|
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memo[0] += i
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memo[1] *= i
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}
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assert_same(obj, ret)
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assert_equal([55, 3628800], ret)
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a = [2,5,2,1,5,3,4,2,1,0]
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obj = {}
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ret = a.delete_if.with_object(obj) {|i, seen|
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if seen.key?(i)
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true
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else
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seen[i] = true
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false
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end
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}
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assert_same(obj, ret)
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assert_equal([2, 5, 1, 3, 4, 0], a)
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end
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def test_next_rewind
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e = @obj.to_enum(:foo, 1, 2, 3)
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assert_equal(1, e.next)
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assert_equal(2, e.next)
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e.rewind
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assert_equal(1, e.next)
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assert_equal(2, e.next)
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assert_equal(3, e.next)
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assert_raise(StopIteration) { e.next }
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end
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def test_peek
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a = [1]
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e = a.each
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assert_equal(1, e.peek)
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assert_equal(1, e.peek)
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assert_equal(1, e.next)
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assert_raise(StopIteration) { e.peek }
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assert_raise(StopIteration) { e.peek }
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end
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def test_peek_modify
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o = Object.new
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def o.each
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yield 1,2
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end
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e = o.to_enum
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a = e.peek
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a << 3
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assert_equal([1,2], e.peek)
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end
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def test_peek_values_modify
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o = Object.new
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def o.each
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yield 1,2
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end
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e = o.to_enum
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a = e.peek_values
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a << 3
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assert_equal([1,2], e.peek)
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end
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def test_next_after_stopiteration
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a = [1]
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e = a.each
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assert_equal(1, e.next)
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assert_raise(StopIteration) { e.next }
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assert_raise(StopIteration) { e.next }
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e.rewind
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assert_equal(1, e.next)
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assert_raise(StopIteration) { e.next }
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assert_raise(StopIteration) { e.next }
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end
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def test_stop_result
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a = [1]
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res = a.each {}
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e = a.each
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assert_equal(1, e.next)
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exc = assert_raise(StopIteration) { e.next }
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assert_equal(res, exc.result)
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end
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def test_next_values
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o = Object.new
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def o.each
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yield
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yield 1
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yield 1, 2
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end
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e = o.to_enum
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assert_equal(nil, e.next)
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assert_equal(1, e.next)
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assert_equal([1,2], e.next)
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e = o.to_enum
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assert_equal([], e.next_values)
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assert_equal([1], e.next_values)
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assert_equal([1,2], e.next_values)
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end
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def test_peek_values
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o = Object.new
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def o.each
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yield
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yield 1
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yield 1, 2
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end
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e = o.to_enum
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assert_equal(nil, e.peek)
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assert_equal(nil, e.next)
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assert_equal(1, e.peek)
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assert_equal(1, e.next)
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assert_equal([1,2], e.peek)
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assert_equal([1,2], e.next)
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e = o.to_enum
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assert_equal([], e.peek_values)
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assert_equal([], e.next_values)
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assert_equal([1], e.peek_values)
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assert_equal([1], e.next_values)
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assert_equal([1,2], e.peek_values)
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assert_equal([1,2], e.next_values)
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e = o.to_enum
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assert_equal([], e.peek_values)
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assert_equal(nil, e.next)
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assert_equal([1], e.peek_values)
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assert_equal(1, e.next)
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assert_equal([1,2], e.peek_values)
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assert_equal([1,2], e.next)
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e = o.to_enum
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assert_equal(nil, e.peek)
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assert_equal([], e.next_values)
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assert_equal(1, e.peek)
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assert_equal([1], e.next_values)
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assert_equal([1,2], e.peek)
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assert_equal([1,2], e.next_values)
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end
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def test_feed
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.next
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e.feed 1
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e.next
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e.feed 2
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e.next
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e.feed 3
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assert_raise(StopIteration) { e.next }
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assert_equal([1,2,3], ary)
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end
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def test_feed_mixed
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.next
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e.feed 1
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e.next
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e.next
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e.feed 3
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assert_raise(StopIteration) { e.next }
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assert_equal([1,nil,3], ary)
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end
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def test_feed_twice
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.feed 1
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assert_raise(TypeError) { e.feed 2 }
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end
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def test_feed_before_first_next
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.feed 1
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e.next
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e.next
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assert_equal([1], ary)
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end
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def test_rewind_clear_feed
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o = Object.new
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def o.each(ary)
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ary << yield
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ary << yield
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ary << yield
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end
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ary = []
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e = o.to_enum(:each, ary)
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e.next
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e.feed 1
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e.next
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e.feed 2
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e.rewind
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e.next
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e.next
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assert_equal([1,nil], ary)
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end
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def test_feed_yielder
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x = nil
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e = Enumerator.new {|y| x = y.yield; 10 }
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e.next
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e.feed 100
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exc = assert_raise(StopIteration) { e.next }
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assert_equal(100, x)
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assert_equal(10, exc.result)
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end
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end
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