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# -*- encoding: us-ascii -*-
require File.expand_path('../../../../spec_helper', __FILE__)
describe "Enumerator::Lazy#initialize" do
before :each do
@receiver = receiver = Object.new
def receiver.each
yield 0
yield 1
yield 2
end
@uninitialized = Enumerator::Lazy.allocate
end
it "is a private method" do
Enumerator::Lazy.should have_private_instance_method(:initialize, false)
end
it "returns self" do
@uninitialized.send(:initialize, @receiver) {}.should equal(@uninitialized)
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
@uninitialized.send(:initialize, @receiver) do |yielder, *values|
yielder.<<(*values)
end.first(2).should == [0, 1]
end
end
it "sets #size to nil if not given a size" do
@uninitialized.send(:initialize, @receiver) {}.size.should be_nil
end
it "sets #size to nil if given size is nil" do
@uninitialized.send(:initialize, @receiver, nil) {}.size.should be_nil
end
it "sets given size to own size if the given size is Float::INFINITY" do
@uninitialized.send(:initialize, @receiver, Float::INFINITY) {}.size.should equal(Float::INFINITY)
end
it "sets given size to own size if the given size is a Fixnum" do
@uninitialized.send(:initialize, @receiver, 100) {}.size.should == 100
end
it "sets given size to own size if the given size is a Proc" do
@uninitialized.send(:initialize, @receiver, lambda { 200 }) {}.size.should == 200
end
it "raises an ArgumentError when block is not given" do
lambda { @uninitialized.send :initialize, @receiver }.should raise_error(ArgumentError)
end
describe "on frozen instance" do
it "raises a RuntimeError" do
lambda { @uninitialized.freeze.send(:initialize, @receiver) {} }.should raise_error(RuntimeError)
end
end
end
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