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# -*- encoding: us-ascii -*-
require_relative '../../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerator::Lazy#reject" 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.reject {}
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) {}.reject {}.size.should == nil
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.reject(&:even?).first(3).should == [1, 3, 5]
@eventsmixed.reject { false }.first(1)
ScratchPad.recorded.should == [:before_yield]
end
end
it "lets exceptions raised in the block go through" do
lazy = 10.times.lazy.map do |i|
raise "foo"
end
lazy = lazy.reject(&:nil?)
-> {
lazy.first
}.should raise_error(RuntimeError, "foo")
end
it "calls the block with a gathered array when yield with multiple arguments" do
yields = []
@yieldsmixed.reject { |v| yields << v }.force
yields.should == EnumeratorLazySpecs::YieldsMixed.gathered_yields
end
it "raises an ArgumentError when not given a block" do
-> { @yieldsmixed.reject }.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).reject {}.size.should == nil
end
describe "when the returned lazy enumerator is evaluated by Enumerable#first" do
it "stops after specified times" do
(0..Float::INFINITY).lazy.reject { |n| n < 4 }.reject(&:even?).first(3).should == [5, 7, 9]
@eventsmixed.reject { false }.reject { false }.first(1)
ScratchPad.recorded.should == [:before_yield]
end
end
end
it "works with an infinite enumerable" do
s = 0..Float::INFINITY
s.lazy.reject { |n| false }.first(100).should ==
s.first(100).reject { |n| false }
end
end
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