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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerator::Lazy#zip" do
before :each do
@yieldsmixed = EnumeratorLazySpecs::YieldsMixed.new.to_enum.lazy
@eventsmixed = EnumeratorLazySpecs::EventsMixed.new.to_enum.lazy
ScratchPad.record []
end
after :each do
ScratchPad.clear
end
it "returns a new instance of Enumerator::Lazy" do
ret = @yieldsmixed.zip []
ret.should be_an_instance_of(Enumerator::Lazy)
ret.should_not equal(@yieldsmixed)
end
it "keeps size" do
Enumerator::Lazy.new(Object.new, 100) {}.zip([], []).size.should == 100
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.zip([4, 5], [8]).first(2).should == [[0, 4, 8], [1, 5, nil]]
@eventsmixed.zip([0, 1]).first(1)
ScratchPad.recorded.should == [:before_yield]
end
end
it "calls the block with a gathered array when yield with multiple arguments" do
yields = @yieldsmixed.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum).force
yields.should == [EnumeratorLazySpecs::YieldsMixed.gathered_yields,
EnumeratorLazySpecs::YieldsMixed.gathered_yields].transpose
end
it "returns a Lazy when no arguments given" do
@yieldsmixed.zip.should be_an_instance_of(Enumerator::Lazy)
end
it "raises a TypeError if arguments contain non-list object" do
-> { @yieldsmixed.zip [], Object.new, [] }.should raise_error(TypeError)
end
describe "on a nested Lazy" do
it "keeps size" do
Enumerator::Lazy.new(Object.new, 100) {}.map {}.zip([], []).size.should == 100
end
it "behaves as Enumerable#zip when given a block" do
lazy_yields = []
lazy_ret = @yieldsmixed.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum) { |lists| lazy_yields << lists }
enum_yields = []
enum_ret = EnumeratorLazySpecs::YieldsMixed.new.to_enum.zip(EnumeratorLazySpecs::YieldsMixed.new.to_enum) { |lists| enum_yields << lists }
lazy_yields.should == enum_yields
lazy_ret.should == enum_ret
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.map(&:succ).zip([4, 5], [8]).first(2).should == [[1, 4, 8], [2, 5, nil]]
@eventsmixed.zip([0, 1]).zip([0, 1]).first(1)
ScratchPad.recorded.should == [:before_yield]
end
end
end
it "works with an infinite enumerable and an array" do
s = 0..Float::INFINITY
s.lazy.zip(0..1000).first(100).should ==
s.first(100).zip(0..100)
end
it "works with two infinite enumerables" do
s = 0..Float::INFINITY
s.lazy.zip(s).first(100).should ==
s.first(100).zip(s)
end
end
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