require File.expand_path('../../../../spec_helper', __FILE__)

describe "Enumerator::Generator#each" do
  before :each do
    @generator = Enumerator::Generator.new do |y, *args|
      y << 3 << 2 << 1
      y << args unless args.empty?
      :block_returned
    end
  end

  it "is an enumerable" do
    @generator.should be_kind_of(Enumerable)
  end

  it "supports enumeration with a block" do
    r = []
    @generator.each { |v| r << v }

    r.should == [3, 2, 1]
  end

  it "raises a LocalJumpError if no block given" do
    lambda { @generator.each }.should raise_error(LocalJumpError)
  end

  it "returns the block returned value" do
    @generator.each {}.should equal(:block_returned)
  end

  it "requires multiple arguments" do
    Enumerator::Generator.instance_method(:each).arity.should < 0
  end

  it "appends given arguments to receiver.each" do
    yields = []
    @generator.each(:each0, :each1) { |yielded| yields << yielded }
    yields.should == [3, 2, 1, [:each0, :each1]]
  end
end