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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'shared/select'
describe "Enumerator::Lazy#select" do
it_behaves_like :enumerator_lazy_select, :select
it "doesn't pre-evaluate the next element" do
eval_count = 0
enum = %w[Text1 Text2 Text3].lazy.select do
eval_count += 1
true
end
eval_count.should == 0
enum.next
eval_count.should == 1
end
it "doesn't over-evaluate when peeked" do
eval_count = 0
enum = %w[Text1 Text2 Text3].lazy.select do
eval_count += 1
true
end
eval_count.should == 0
enum.peek
enum.peek
eval_count.should == 1
end
it "doesn't re-evaluate after peek" do
eval_count = 0
enum = %w[Text1 Text2 Text3].lazy.select do
eval_count += 1
true
end
eval_count.should == 0
enum.peek
eval_count.should == 1
enum.next
eval_count.should == 1
end
end
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