TypeError: wrong argument type class (expected module) in rspec - ruby

Question

i'm developing a simple net application (packed as a gem) to learn Ruby and TDD.
I have this class (receiver.rb):
require 'eventmachine'
class Receiver < EM::Connection
def initialize(port)
EM.run do
EM.open_datagram_socket('0.0.0.0', port, self)
end
end
end
And this test (receiver_spec.rb):
require "spec_helper"
require "net/receiver"
describe "Receiver" do
it "can istantiate" do
#rec = Receiver.new(500)
end
end
Anyway, when i run rspec it prints out this:
1) Receiver can istantiate
Failure/Error: #rec = Receiver.new(500)
TypeError:
wrong argument type Receiver (expected Module)
# /var/lib/gems/1.9.1/gems/eventmachine- 1.0.7/lib/eventmachine.rb:1535:in `include'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:1535:in `block in klass_from_handler'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:1535:in `initialize'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:1535:in `new'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:1535:in `klass_from_handler'
# /var/lib/gems/1.9.1/gems/eventmachine- 1.0.7/lib/eventmachine.rb:867:in `open_datagram_socket'
# ./lib/rppc/net/receiver.rb:9:in `block in initialize'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:187:in `call'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:187:in `run_machine'
# /var/lib/gems/1.9.1/gems/eventmachine-1.0.7/lib/eventmachine.rb:187:in `run'
# ./lib/rppc/net/receiver.rb:8:in `initialize'
# ./spec/net/receiver_spec.rb:6:in `new'
# ./spec/net/receiver_spec.rb:6:in `block (2 levels) in <top (required)>'
I'm quite new to the ruby environment, so if i missed something let me know.

Answer 1

I'm not sure what documentation you're working from, but it appears the open_datagram_socket requires a Module and cannot accept a Class as the third (handler) argument.
Per the comment in http://www.rubydoc.info/github/eventmachine/eventmachine/EventMachine.open_datagram_socket, it appears this restriction may have been loosened in a later version of EventMachine