Fiber sample

fiber_spec.rb

# coding: utf-8

require 'rspec'
require 'fiber'

describe 'FiberTest' do
  let(:fiber) do
    Fiber.new do |name|
      last_name = Fiber.yield("#{name}")
      puts "#{name} #{last_name}"
    end
  end

  describe '.current()' do
    subject { Fiber.current() }
    it { should be_instance_of(Fiber) }
  end

  # Can't yield from root fiber
  describe '.yield()' do
    subject { Fiber.yield("pochi") }
    it do
      expect { subject }.to raise_exception(FiberError)
    end
  end

  describe '#alive?' do
    describe 'when fiber alive' do
      context 'never called' do
        subject { fiber.alive? }
        it { should be_true }
      end

      context 'once called' do
        before { fiber.resume("pochi") }
        subject { fiber.alive? }
        it { should be_true }
      end
    end

    context 'when fiver dead' do
      before { 2.times { |_| fiber.resume("pochi") } }
      subject { fiber.alive? }
      it { should be_false }
    end
  end

  describe '#resume(name)' do
    context 'when once called' do
      subject { fiber.resume("pochi") }
      it { should == "pochi" }
    end

    context "when twice called" do
      before { fiber.resume("pochi") }
      subject { fiber.resume("kuroda") }
      it { should = "kuroda pochi pochi" }
    end
  end
end