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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerator::Lazy#chunk" 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.chunk {}
ret.should be_an_instance_of(Enumerator::Lazy)
ret.should_not equal(@yieldsmixed)
end
it "sets #size to nil" do
Enumerator::Lazy.new(Object.new, 100) {}.chunk { |v| v }.size.should == nil
end
it "returns an Enumerator if called without a block" do
chunk = @yieldsmixed.chunk
chunk.should be_an_instance_of(Enumerator::Lazy)
res = chunk.each { |v| true }.force
res.should == [[true, EnumeratorLazySpecs::YieldsMixed.gathered_yields]]
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
first_two = (0..Float::INFINITY).lazy.chunk { |n| n.even? }.first(2)
first_two.should == [[true, [0]], [false, [1]]]
end
end
it "calls the block with gathered values when yield with multiple arguments" do
yields = []
@yieldsmixed.chunk { |v| yields << v; true }.force
yields.should == EnumeratorLazySpecs::YieldsMixed.gathered_yields
end
describe "on a nested Lazy" do
it "sets #size to nil" do
Enumerator::Lazy.new(Object.new, 100) {}.take(20).chunk { |v| v }.size.should == nil
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
remains_lazy = (0..Float::INFINITY).lazy.chunk { |n| n }
remains_lazy.chunk { |n| n }.first(2).size.should == 2
end
end
end
it "works with an infinite enumerable" do
s = 0..Float::INFINITY
s.lazy.chunk { |n| n.even? }.first(100).should ==
s.first(100).chunk { |n| n.even? }.to_a
end
end
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