require_relative '../../../spec_helper'
require_relative '../../shared/enumerator/with_index'
require_relative '../enumerable/shared/enumeratorized'

describe "Enumerator#each_with_index" do
  it_behaves_like :enum_with_index, :each_with_index
  it_behaves_like :enumeratorized_with_origin_size, :each_with_index, Grizzly::Enumerator.new([1,2,3].select)

  before do
    @subject = Grizzly::Enumerator
    @enum = @subject.new @enum
  end

  it "returns a new Enumerator when no block is given" do
    enum1 = @subject.new([1,2,3].select)
    enum2 = enum1.each_with_index
    enum2.should be_an_instance_of(@subject)
    enum1.should_not == enum2
  end

  it "raises an ArgumentError if passed extra arguments" do
    -> do
      @subject.new([1].to_enum).each_with_index(:glark)
    end.should raise_error(ArgumentError)
  end

  it "passes on the given block's return value" do
    arr = [1,2,3]
    @subject.new(arr.delete_if).each_with_index { |a,b| false }
    arr.should == [1,2,3]
  end

  it "returns the iterator's return value" do
    @subject.new([1,2,3].select).each_with_index { |a,b| false }.should == []
  end

  it "returns the correct value if chained with itself" do
    @subject.new([:a].each_with_index).each_with_index.to_a.should == [[[:a,0],0]]
    @subject.new([:a].each).with_index.with_index.to_a.should == [[[:a,0],0]]
  end
end
