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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerator::Lazy#take_while" 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_while {}
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) {}.take_while { true }.size.should == nil
end
describe "when the returned lazy enumerator is evaluated by .force" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.take_while { |n| n < 3 }.force.should == [0, 1, 2]
@eventsmixed.take_while { false }.force
ScratchPad.recorded.should == [:before_yield]
end
end
it "calls the block with initial values when yield with multiple arguments" do
yields = []
@yieldsmixed.take_while { |v| yields << v; true }.force
yields.should == EnumeratorLazySpecs::YieldsMixed.initial_yields
end
it "raises an ArgumentError when not given a block" do
-> { @yieldsmixed.take_while }.should raise_error(ArgumentError)
end
describe "on a nested Lazy" do
it "sets #size to nil" do
Enumerator::Lazy.new(Object.new, 100) {}.take(20).take_while { true }.size.should == nil
end
describe "when the returned lazy enumerator is evaluated by .force" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.take_while { |n| n < 3 }.take_while(&:even?).force.should == [0]
@eventsmixed.take_while { true }.take_while { false }.force
ScratchPad.recorded.should == [:before_yield]
end
end
end
end
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