/test/ruby/test_enumerator.rb
Ruby | 883 lines | 762 code | 105 blank | 16 comment | 6 complexity | 227e8c2733d17dffb804c8459a8c6274 MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause, AGPL-3.0
- # frozen_string_literal: false
- 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
- @sized = @obj.clone
- def @sized.size
- 42
- end
- end
- def enum_test obj
- 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}.each)
- 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_loop_return_value
- assert_equal nil, loop { break }
- assert_equal 42, loop { break 42 }
- e = Enumerator.new { |y| y << 1; y << 2; :stopped }
- assert_equal :stopped, loop { e.next while true }
- end
- def test_nested_iteration
- 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)
- _, err = capture_io do
- assert_equal([1, 2, 3], Enumerator.new(@obj, :foo, 1, 2, 3).to_a)
- end
- assert_match 'Enumerator.new without a block is deprecated', err
- assert_equal([1, 2, 3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.take(3))
- assert_raise(ArgumentError) { Enumerator.new }
- enum = @obj.to_enum
- assert_raise(NoMethodError) { enum.each {} }
- enum.freeze
- assert_raise(FrozenError) {
- capture_io do
- # warning: Enumerator.new without a block is deprecated; use Object#to_enum
- enum.__send__(:initialize, @obj, :foo)
- end
- }
- 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 }
- e = Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.dup
- 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
- foo
- 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_each_slice_size
- assert_equal(4, (1..10).each_slice(3).size)
- assert_equal(Float::INFINITY, 1.step.each_slice(3).size)
- 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)
- assert_equal([[1,5],[2,6],[3,7]], @obj.to_enum(:foo, 1, 2, 3).with_index(5).to_a)
- end
- def test_with_index_large_offset
- bug8010 = '[ruby-dev:47131] [Bug #8010]'
- s = 1 << (8*1.size-2)
- assert_equal([[1,s],[2,s+1],[3,s+2]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a, bug8010)
- s <<= 1
- assert_equal([[1,s],[2,s+1],[3,s+2]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a, bug8010)
- end
- def test_with_index_nonnum_offset
- bug8010 = '[ruby-dev:47131] [Bug #8010]'
- s = Object.new
- def s.to_int; 1 end
- assert_equal([[1,1],[2,2],[3,3]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a, bug8010)
- end
- def test_with_index_string_offset
- bug8010 = '[ruby-dev:47131] [Bug #8010]'
- assert_raise(TypeError, bug8010){ @obj.to_enum(:foo, 1, 2, 3).with_index('1').to_a }
- end
- def test_with_index_dangling_memo
- bug9178 = '[ruby-core:58692] [Bug #9178]'
- assert_separately([], <<-"end;")
- bug = "#{bug9178}"
- e = [1].to_enum(:chunk).with_index {|c,i| i == 5}
- assert_kind_of(Enumerator, e)
- assert_equal([false, [1]], e.to_a[0], bug)
- end;
- end
- def test_with_object
- obj = [0, 1]
- ret = (1..10).each.with_object(obj) {|i, memo|
- memo[0] += i
- memo[1] *= i
- }
- assert_same(obj, ret)
- assert_equal([55, 3628800], ret)
- a = [2,5,2,1,5,3,4,2,1,0]
- obj = {}
- ret = a.delete_if.with_object(obj) {|i, seen|
- if seen.key?(i)
- true
- else
- seen[i] = true
- false
- end
- }
- assert_same(obj, ret)
- 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
- def test_peek
- a = [1]
- e = a.each
- assert_equal(1, e.peek)
- assert_equal(1, e.peek)
- assert_equal(1, e.next)
- assert_raise(StopIteration) { e.peek }
- assert_raise(StopIteration) { e.peek }
- end
- def test_peek_modify
- o = Object.new
- def o.each
- yield 1,2
- end
- e = o.to_enum
- a = e.peek
- a << 3
- assert_equal([1,2], e.peek)
- end
- def test_peek_values_modify
- o = Object.new
- def o.each
- yield 1,2
- end
- e = o.to_enum
- a = e.peek_values
- a << 3
- assert_equal([1,2], e.peek)
- end
- def test_next_after_stopiteration
- a = [1]
- e = a.each
- assert_equal(1, e.next)
- assert_raise(StopIteration) { e.next }
- assert_raise(StopIteration) { e.next }
- e.rewind
- assert_equal(1, e.next)
- assert_raise(StopIteration) { e.next }
- assert_raise(StopIteration) { e.next }
- end
- def test_stop_result
- a = [1]
- res = a.each {}
- e = a.each
- assert_equal(1, e.next)
- exc = assert_raise(StopIteration) { e.next }
- assert_equal(res, exc.result)
- end
- def test_next_values
- o = Object.new
- def o.each
- yield
- yield 1
- yield 1, 2
- end
- e = o.to_enum
- assert_equal(nil, e.next)
- assert_equal(1, e.next)
- assert_equal([1,2], e.next)
- e = o.to_enum
- assert_equal([], e.next_values)
- assert_equal([1], e.next_values)
- assert_equal([1,2], e.next_values)
- end
- def test_peek_values
- o = Object.new
- def o.each
- yield
- yield 1
- yield 1, 2
- end
- e = o.to_enum
- assert_equal(nil, e.peek)
- assert_equal(nil, e.next)
- assert_equal(1, e.peek)
- assert_equal(1, e.next)
- assert_equal([1,2], e.peek)
- assert_equal([1,2], e.next)
- e = o.to_enum
- assert_equal([], e.peek_values)
- assert_equal([], e.next_values)
- assert_equal([1], e.peek_values)
- assert_equal([1], e.next_values)
- assert_equal([1,2], e.peek_values)
- assert_equal([1,2], e.next_values)
- e = o.to_enum
- assert_equal([], e.peek_values)
- assert_equal(nil, e.next)
- assert_equal([1], e.peek_values)
- assert_equal(1, e.next)
- assert_equal([1,2], e.peek_values)
- assert_equal([1,2], e.next)
- e = o.to_enum
- assert_equal(nil, e.peek)
- assert_equal([], e.next_values)
- assert_equal(1, e.peek)
- assert_equal([1], e.next_values)
- assert_equal([1,2], e.peek)
- assert_equal([1,2], e.next_values)
- end
- def test_each_arg
- o = Object.new
- def o.each(ary)
- ary << 1
- yield
- end
- ary = []
- e = o.to_enum { 1 }
- assert_equal(1, e.size)
- e_arg = e.each(ary)
- assert_equal(nil, e_arg.size)
- e_arg.next
- assert_equal([1], ary)
- end
- def test_feed
- o = Object.new
- def o.each(ary)
- ary << yield
- ary << yield
- ary << yield
- end
- ary = []
- e = o.to_enum(:each, ary)
- e.next
- e.feed 1
- e.next
- e.feed 2
- e.next
- e.feed 3
- assert_raise(StopIteration) { e.next }
- assert_equal([1,2,3], ary)
- end
- def test_feed_mixed
- o = Object.new
- def o.each(ary)
- ary << yield
- ary << yield
- ary << yield
- end
- ary = []
- e = o.to_enum(:each, ary)
- e.next
- e.feed 1
- e.next
- e.next
- e.feed 3
- assert_raise(StopIteration) { e.next }
- assert_equal([1,nil,3], ary)
- end
- def test_feed_twice
- o = Object.new
- def o.each(ary)
- ary << yield
- ary << yield
- ary << yield
- end
- ary = []
- e = o.to_enum(:each, ary)
- e.feed 1
- assert_raise(TypeError) { e.feed 2 }
- end
- def test_feed_before_first_next
- o = Object.new
- def o.each(ary)
- ary << yield
- ary << yield
- ary << yield
- end
- ary = []
- e = o.to_enum(:each, ary)
- e.feed 1
- e.next
- e.next
- assert_equal([1], ary)
- end
- def test_rewind_clear_feed
- o = Object.new
- def o.each(ary)
- ary << yield
- ary << yield
- ary << yield
- end
- ary = []
- e = o.to_enum(:each, ary)
- e.next
- e.feed 1
- e.next
- e.feed 2
- e.rewind
- e.next
- e.next
- assert_equal([1,nil], ary)
- end
- def test_feed_yielder
- x = nil
- e = Enumerator.new {|y| x = y.yield; 10 }
- e.next
- e.feed 100
- exc = assert_raise(StopIteration) { e.next }
- assert_equal(100, x)
- assert_equal(10, exc.result)
- end
- def test_inspect
- e = (0..10).each_cons(2)
- assert_equal("#<Enumerator: 0..10:each_cons(2)>", e.inspect)
- e = (0..10).each_with_object({})
- assert_equal("#<Enumerator: 0..10:each_with_object({})>", e.inspect)
- e = (0..10).each_with_object(a: 1)
- assert_equal("#<Enumerator: 0..10:each_with_object(a: 1)>", e.inspect)
- e = Enumerator.new {|y| y.yield; 10 }
- assert_match(/\A#<Enumerator: .*:each>/, e.inspect)
- a = []
- e = a.each_with_object(a)
- a << e
- assert_equal("#<Enumerator: [#<Enumerator: ...>]:each_with_object([#<Enumerator: ...>])>",
- e.inspect)
- end
- def test_inspect_verbose
- bug6214 = '[ruby-dev:45449]'
- assert_warning("", bug6214) { "".bytes.inspect }
- assert_warning("", bug6214) { [].lazy.inspect }
- end
- def test_inspect_encoding
- c = Class.new{define_method("\u{3042}"){}}
- e = c.new.enum_for("\u{3042}")
- s = assert_nothing_raised(Encoding::CompatibilityError) {break e.inspect}
- assert_equal(Encoding::UTF_8, s.encoding)
- assert_match(/\A#<Enumerator: .*:\u{3042}>\z/, s)
- end
- def test_generator
- # note: Enumerator::Generator is a class just for internal
- g = Enumerator::Generator.new {|y| y << 1 << 2 << 3; :foo }
- g2 = g.dup
- a = []
- assert_equal(:foo, g.each {|x| a << x })
- assert_equal([1, 2, 3], a)
- a = []
- assert_equal(:foo, g2.each {|x| a << x })
- assert_equal([1, 2, 3], a)
- g.freeze
- assert_raise(FrozenError) {
- g.__send__ :initialize, proc { |y| y << 4 << 5 }
- }
- g = Enumerator::Generator.new(proc {|y| y << 4 << 5; :foo })
- a = []
- assert_equal(:foo, g.each {|x| a << x })
- assert_equal([4, 5], a)
- assert_raise(LocalJumpError) {Enumerator::Generator.new}
- assert_raise(TypeError) {Enumerator::Generator.new(1)}
- obj = eval("class C\u{1f5ff}; self; end").new
- assert_raise_with_message(TypeError, /C\u{1f5ff}/) {
- Enumerator::Generator.new(obj)
- }
- end
- def test_generator_args
- g = Enumerator::Generator.new {|y, x| y << 1 << 2 << 3; x }
- a = []
- assert_equal(:bar, g.each(:bar) {|x| a << x })
- assert_equal([1, 2, 3], a)
- end
- def test_yielder
- # note: Enumerator::Yielder is a class just for internal
- a = []
- y = Enumerator::Yielder.new {|x| a << x }
- assert_equal(y, y << 1 << 2 << 3)
- assert_equal([1, 2, 3], a)
- a = []
- y = Enumerator::Yielder.new {|x| a << x }
- assert_equal([1], y.yield(1))
- assert_equal([1, 2], y.yield(2))
- assert_equal([1, 2, 3], y.yield(3))
- assert_equal([1, 2, 3, 4], y.yield(4, 5))
- a = []
- y = Enumerator::Yielder.new {|*x| a.concat(x) }
- assert_equal([1], y.yield(1))
- assert_equal([1, 2, 3], y.yield(2, 3))
- assert_raise(LocalJumpError) { Enumerator::Yielder.new }
- # to_proc (explicit)
- a = []
- y = Enumerator::Yielder.new {|x| a << x }
- b = y.to_proc
- assert_kind_of(Proc, b)
- assert_equal([1], b.call(1))
- assert_equal([1], a)
- # to_proc (implicit)
- e = Enumerator.new { |y|
- assert_kind_of(Enumerator::Yielder, y)
- [1, 2, 3].each(&y)
- }
- assert_equal([1, 2, 3], e.to_a)
- end
- def test_size
- assert_equal nil, Enumerator.new{}.size
- assert_equal 42, Enumerator.new(->{42}){}.size
- obj = Object.new
- def obj.call; 42; end
- assert_equal 42, Enumerator.new(obj){}.size
- assert_equal 42, Enumerator.new(42){}.size
- assert_equal 1 << 70, Enumerator.new(1 << 70){}.size
- assert_equal Float::INFINITY, Enumerator.new(Float::INFINITY){}.size
- assert_equal nil, Enumerator.new(nil){}.size
- assert_raise(TypeError) { Enumerator.new("42"){} }
- assert_equal nil, @obj.to_enum(:foo, 0, 1).size
- assert_equal 2, @obj.to_enum(:foo, 0, 1){ 2 }.size
- end
- def test_size_for_enum_created_by_enumerators
- enum = to_enum{ 42 }
- assert_equal 42, enum.with_index.size
- assert_equal 42, enum.with_object(:foo).size
- end
- def test_size_for_enum_created_from_array
- arr = %w[hello world]
- %i[each each_with_index reverse_each sort_by! sort_by map map!
- keep_if reject! reject select! select filter! filter delete_if].each do |method|
- assert_equal arr.size, arr.send(method).size
- end
- end
- def test_size_for_enum_created_from_enumerable
- %i[find_all reject map flat_map partition group_by sort_by min_by max_by
- minmax_by each_with_index reverse_each each_entry filter_map].each do |method|
- assert_equal nil, @obj.send(method).size
- assert_equal 42, @sized.send(method).size
- end
- assert_equal nil, @obj.each_with_object(nil).size
- assert_equal 42, @sized.each_with_object(nil).size
- end
- def test_size_for_enum_created_from_hash
- h = {a: 1, b: 2, c: 3}
- methods = %i[delete_if reject reject! select select! filter filter! keep_if each each_key each_pair]
- enums = methods.map {|method| h.send(method)}
- s = enums.group_by(&:size)
- assert_equal([3], s.keys, ->{s.reject!{|k| k==3}.inspect})
- h[:d] = 4
- s = enums.group_by(&:size)
- assert_equal([4], s.keys, ->{s.reject!{|k| k==4}.inspect})
- end
- def test_size_for_enum_created_from_env
- %i[each_pair reject! delete_if select select! filter filter! keep_if].each do |method|
- assert_equal ENV.size, ENV.send(method).size
- end
- end
- def test_size_for_enum_created_from_struct
- s = Struct.new(:foo, :bar, :baz).new(1, 2)
- %i[each each_pair select].each do |method|
- assert_equal 3, s.send(method).size
- end
- end
- def check_consistency_for_combinatorics(method)
- [ [], [:a, :b, :c, :d, :e] ].product([-2, 0, 2, 5, 6]) do |array, arg|
- assert_equal array.send(method, arg).to_a.size, array.send(method, arg).size,
- "inconsistent size for #{array}.#{method}(#{arg})"
- end
- end
- def test_size_for_array_combinatorics
- check_consistency_for_combinatorics(:permutation)
- assert_equal 24, [0, 1, 2, 4].permutation.size
- assert_equal 2933197128679486453788761052665610240000000,
- (1..42).to_a.permutation(30).size # 1.upto(42).inject(:*) / 1.upto(12).inject(:*)
- check_consistency_for_combinatorics(:combination)
- assert_equal 28258808871162574166368460400,
- (1..100).to_a.combination(42).size
- # 1.upto(100).inject(:*) / 1.upto(42).inject(:*) / 1.upto(58).inject(:*)
- check_consistency_for_combinatorics(:repeated_permutation)
- assert_equal 291733167875766667063796853374976,
- (1..42).to_a.repeated_permutation(20).size # 42 ** 20
- check_consistency_for_combinatorics(:repeated_combination)
- assert_equal 28258808871162574166368460400,
- (1..59).to_a.repeated_combination(42).size
- # 1.upto(100).inject(:*) / 1.upto(42).inject(:*) / 1.upto(58).inject(:*)
- end
- def test_size_for_cycle
- assert_equal Float::INFINITY, [:foo].cycle.size
- assert_equal 10, [:foo, :bar].cycle(5).size
- assert_equal 0, [:foo, :bar].cycle(-10).size
- assert_equal Float::INFINITY, {foo: 1}.cycle.size
- assert_equal 10, {foo: 1, bar: 2}.cycle(5).size
- assert_equal 0, {foo: 1, bar: 2}.cycle(-10).size
- assert_equal 0, [].cycle.size
- assert_equal 0, [].cycle(5).size
- assert_equal 0, {}.cycle.size
- assert_equal 0, {}.cycle(5).size
- assert_equal nil, @obj.cycle.size
- assert_equal nil, @obj.cycle(5).size
- assert_equal Float::INFINITY, @sized.cycle.size
- assert_equal 126, @sized.cycle(3).size
- assert_equal Float::INFINITY, [].to_enum { 42 }.cycle.size
- assert_equal 0, [].to_enum { 0 }.cycle.size
- assert_raise(TypeError) {[].to_enum { 0 }.cycle("").size}
- end
- def test_size_for_loops
- assert_equal Float::INFINITY, loop.size
- assert_equal 42, 42.times.size
- end
- def test_size_for_each_slice
- assert_equal nil, @obj.each_slice(3).size
- assert_equal 6, @sized.each_slice(7).size
- assert_equal 5, @sized.each_slice(10).size
- assert_equal 1, @sized.each_slice(70).size
- assert_raise(ArgumentError){ @obj.each_slice(0).size }
- end
- def test_size_for_each_cons
- assert_equal nil, @obj.each_cons(3).size
- assert_equal 33, @sized.each_cons(10).size
- assert_equal 0, @sized.each_cons(70).size
- assert_raise(ArgumentError){ @obj.each_cons(0).size }
- end
- def test_size_for_step
- assert_equal 42, 5.step(46).size
- assert_equal 4, 1.step(10, 3).size
- assert_equal 3, 1.step(9, 3).size
- assert_equal 0, 1.step(-11).size
- assert_equal 0, 1.step(-11, 2).size
- assert_equal 7, 1.step(-11, -2).size
- assert_equal 7, 1.step(-11.1, -2).size
- assert_equal 0, 42.step(Float::INFINITY, -2).size
- assert_equal 1, 42.step(55, Float::INFINITY).size
- assert_equal 1, 42.step(Float::INFINITY, Float::INFINITY).size
- assert_equal 14, 0.1.step(4.2, 0.3).size
- assert_equal Float::INFINITY, 42.step(Float::INFINITY, 2).size
- assert_equal 10, (1..10).step.size
- assert_equal 4, (1..10).step(3).size
- assert_equal 3, (1...10).step(3).size
- assert_equal Float::INFINITY, (42..Float::INFINITY).step(2).size
- assert_equal 0, (1..10).step(-2).size
- end
- def test_size_for_downup_to
- assert_equal 0, 1.upto(-100).size
- assert_equal 102, 1.downto(-100).size
- assert_equal Float::INFINITY, 42.upto(Float::INFINITY).size
- end
- def test_size_for_string
- assert_equal 5, 'hello'.each_byte.size
- assert_equal 5, 'hello'.each_char.size
- assert_equal 5, 'hello'.each_codepoint.size
- end
- def test_peek_for_enumerator_objects
- e = 2.times
- assert_equal(0, e.peek)
- e.next
- assert_equal(1, e.peek)
- e.next
- assert_raise(StopIteration) { e.peek }
- end
- def test_uniq
- u = [0, 1, 0, 1].to_enum.lazy.uniq
- assert_equal([0, 1], u.force)
- assert_equal([0, 1], u.force)
- end
- def test_enum_chain_and_plus
- r = 1..5
- e1 = r.chain()
- assert_kind_of(Enumerator::Chain, e1)
- assert_equal(5, e1.size)
- ary = []
- e1.each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5], ary)
- e2 = r.chain([6, 7, 8])
- assert_kind_of(Enumerator::Chain, e2)
- assert_equal(8, e2.size)
- ary = []
- e2.each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 6, 7, 8], ary)
- e3 = r.chain([6, 7], 8.step)
- assert_kind_of(Enumerator::Chain, e3)
- assert_equal(Float::INFINITY, e3.size)
- ary = []
- e3.take(10).each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], ary)
- # `a + b + c` should not return `Enumerator::Chain.new(a, b, c)`
- # because it is expected that `(a + b).each` be called.
- e4 = e2.dup
- class << e4
- attr_reader :each_is_called
- def each
- super
- @each_is_called = true
- end
- end
- e5 = e4 + 9.step
- assert_kind_of(Enumerator::Chain, e5)
- assert_equal(Float::INFINITY, e5.size)
- ary = []
- e5.take(10).each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], ary)
- assert_equal(true, e4.each_is_called)
- end
- def test_chained_enums
- a = (1..5).each
- e0 = Enumerator::Chain.new()
- assert_kind_of(Enumerator::Chain, e0)
- assert_equal(0, e0.size)
- ary = []
- e0.each { |x| ary << x }
- assert_equal([], ary)
- e1 = Enumerator::Chain.new(a)
- assert_kind_of(Enumerator::Chain, e1)
- assert_equal(5, e1.size)
- ary = []
- e1.each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5], ary)
- e2 = Enumerator::Chain.new(a, [6, 7, 8])
- assert_kind_of(Enumerator::Chain, e2)
- assert_equal(8, e2.size)
- ary = []
- e2.each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 6, 7, 8], ary)
- e3 = Enumerator::Chain.new(a, [6, 7], 8.step)
- assert_kind_of(Enumerator::Chain, e3)
- assert_equal(Float::INFINITY, e3.size)
- ary = []
- e3.take(10).each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], ary)
- e4 = Enumerator::Chain.new(a, Enumerator.new { |y| y << 6 << 7 << 8 })
- assert_kind_of(Enumerator::Chain, e4)
- assert_equal(nil, e4.size)
- ary = []
- e4.each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 6, 7, 8], ary)
- e5 = Enumerator::Chain.new(e1, e2)
- assert_kind_of(Enumerator::Chain, e5)
- assert_equal(13, e5.size)
- ary = []
- e5.each { |x| ary << x }
- assert_equal([1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 6, 7, 8], ary)
- rewound = []
- e1.define_singleton_method(:rewind) { rewound << object_id }
- e2.define_singleton_method(:rewind) { rewound << object_id }
- e5.rewind
- assert_equal(rewound, [e2.object_id, e1.object_id])
- rewound = []
- a = [1]
- e6 = Enumerator::Chain.new(a)
- a.define_singleton_method(:rewind) { rewound << object_id }
- e6.rewind
- assert_equal(rewound, [])
- assert_equal(
- '#<Enumerator::Chain: [' +
- '#<Enumerator::Chain: [' +
- '#<Enumerator: 1..5:each>' +
- ']>, ' +
- '#<Enumerator::Chain: [' +
- '#<Enumerator: 1..5:each>, ' +
- '[6, 7, 8]' +
- ']>' +
- ']>',
- e5.inspect
- )
- end
- def test_produce
- assert_raise(ArgumentError) { Enumerator.produce }
- # Without initial object
- passed_args = []
- enum = Enumerator.produce { |obj| passed_args << obj; (obj || 0).succ }
- assert_instance_of(Enumerator, enum)
- assert_equal Float::INFINITY, enum.size
- assert_equal [1, 2, 3], enum.take(3)
- assert_equal [nil, 1, 2], passed_args
- # With initial object
- passed_args = []
- enum = Enumerator.produce(1) { |obj| passed_args << obj; obj.succ }
- assert_instance_of(Enumerator, enum)
- assert_equal Float::INFINITY, enum.size
- assert_equal [1, 2, 3], enum.take(3)
- assert_equal [1, 2], passed_args
- # With initial keyword arguments
- passed_args = []
- enum = Enumerator.produce(a: 1, b: 1) { |obj| passed_args << obj; obj.shift if obj.respond_to?(:shift)}
- assert_instance_of(Enumerator, enum)
- assert_equal Float::INFINITY, enum.size
- assert_equal [{b: 1}, [1], :a, nil], enum.take(4)
- assert_equal [{b: 1}, [1], :a], passed_args
- # Raising StopIteration
- words = "The quick brown fox jumps over the lazy dog.".scan(/\w+/)
- enum = Enumerator.produce { words.shift or raise StopIteration }
- assert_equal Float::INFINITY, enum.size
- assert_instance_of(Enumerator, enum)
- assert_equal %w[The quick brown fox jumps over the lazy dog], enum.to_a
- # Raising StopIteration
- object = [[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"], "stuv", "wxyz"]
- enum = Enumerator.produce(object) { |obj|
- obj.respond_to?(:first) or raise StopIteration
- obj.first
- }
- assert_equal Float::INFINITY, enum.size
- assert_instance_of(Enumerator, enum)
- assert_nothing_raised {
- assert_equal [
- [[[["abc", "def"], "ghi", "jkl"], "mno", "pqr"], "stuv", "wxyz"],
- [[["abc", "def"], "ghi", "jkl"], "mno", "pqr"],
- [["abc", "def"], "ghi", "jkl"],
- ["abc", "def"],
- "abc",
- ], enum.to_a
- }
- end
- def test_chain_each_lambda
- c = Class.new do
- include Enumerable
- attr_reader :is_lambda
- def each(&block)
- return to_enum unless block
- @is_lambda = block.lambda?
- end
- end
- e = c.new
- e.chain.each{}
- assert_equal(false, e.is_lambda)
- e.chain.each(&->{})
- assert_equal(true, e.is_lambda)
- end
- end