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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerator::Lazy#take" 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.take(1)
ret.should be_an_instance_of(Enumerator::Lazy)
ret.should_not equal(@yieldsmixed)
end
it "sets given count to size if the given count is less than old size" do
Enumerator::Lazy.new(Object.new, 100) {}.take(20).size.should == 20
Enumerator::Lazy.new(Object.new, 100) {}.take(200).size.should == 100
end
it "sets given count to size if the old size is Infinity" do
loop.lazy.take(20).size.should == 20
end
describe "when the returned lazy enumerator is evaluated by .force" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.take(2).force.should == [0, 1]
@eventsmixed.take(1).force
ScratchPad.recorded.should == [:before_yield]
end
it "stops without iterations if the given argument is 0" do
@eventsmixed.take(0).force
ScratchPad.recorded.should == []
end
end
describe "on a nested Lazy" do
it "sets given count to size if the given count is less than old size" do
Enumerator::Lazy.new(Object.new, 100) {}.take(20).take(50).size.should == 20
Enumerator::Lazy.new(Object.new, 100) {}.take(50).take(20).size.should == 20
end
describe "when the returned lazy enumerator is evaluated by .force" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.map(&:succ).take(2).force.should == [1, 2]
@eventsmixed.take(10).take(1).force
ScratchPad.recorded.should == [:before_yield]
end
it "stops without iterations if the given argument is 0" do
@eventsmixed.take(10).take(0).force
ScratchPad.recorded.should == []
end
end
end
end
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