```ruby
require 'spec_helper'

describe Celluloid::IO::UDPSocket do
  let(:payload) { 'ohai' }
  subject do
    Celluloid::IO::UDPSocket.new.tap do |sock|
      sock.bind example_addr, example_port
    end
  end

  after { subject.close }

  context "inside Celluloid::IO" do
    it "should be evented" do
      within_io_actor { subject.evented? }.should be_true
    end

    it "sends and receives packets" do
      subject.send payload, 0, example_addr, example_port
      subject.recvfrom(payload.size).first.should == payload
    end
  end

  context "outside Celluloid::IO" do
    it "should be blocking" do
      subject.should_not be_evented
    end

    it "sends and receives packets" do
      subject.send payload, 0, example_addr, example_port
      subject.recvfrom(payload.size).first.should == payload
    end
  end
end
```

Add missing within_io_actor block from UDPSocket spec
user
```ruby
require 'spec_helper'

describe Celluloid::IO::UDPSocket do
  let(:payload) { 'ohai' }
  subject do
    Celluloid::IO::UDPSocket.new.tap do |sock|
      sock.bind example_addr, example_port
    end
  end

  after { subject.close }

  context "inside Celluloid::IO" do
    it "should be evented" do
      within_io_actor { subject.evented? }.should be_true
    end

    it "sends and receives packets" do
      within_io_actor do
        subject.send payload, 0, example_addr, example_port
        subject.recvfrom(payload.size).first.should == payload
      end
    end
  end

  context "outside Celluloid::IO" do
    it "should be blocking" do
      subject.should_not be_evented
    end

    it "sends and receives packets" do
      subject.send payload, 0, example_addr, example_port
      subject.recvfrom(payload.size).first.should == payload
    end
  end
end
```
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