Second try to solve the ccc-kata with ruby, this time with a tdd approach

ccckata_tdd.rb

require 'test/unit'
require 'socket'     

class CCCResponder 
	def init_socket
		@hostname = 'localhost'
		@send_port = 9001 
		@rec_port = 9000
		@rec_buffer = 1024
		@rec_socket = UDPSocket.new
		@rec_socket.bind($hostname, @rec_port)
	end

	def operator(line)
		line.split(':')[0]
	end

	def params(line)
		line.split(':')[2..-1].map &:to_i
	end

	def uuid(line)
		line.split(':')[1]
	end

	def calc_result(line)
		ops = {
			'ADD' => :+,
			'SUBTRACT' => :-,
			'MULTIPLY' => :*
		}
		op = ops[operator(line)]
		params(line).reduce(op)	
	end

	def generate_response(line)
		uuid(line) + ':' + calc_result(line).to_s
	end

	def receive
		@rec_socket.recvfrom(@rec_buffer)[0]
	end

	def respond_to line
		response = generate_response(line)
		UDPSocket.new.send(response, 0, @hostname, @send_port)
	end

	def response_loop
		init_socket
		line = receive()
		while operator(line) != '__SHUTDOWN__'
			respond_to line
			line = receive()
		end
		@rec_socket.close
	end	
end

responder = CCCResponder.new
responder.response_loop

class TestCCCResponder < Test::Unit::TestCase

	def setup 
		@responder = CCCResponder.new
	end

	def test_extract_operator
		assert_equal( 'operator', @responder.operator('operator:uuid:param1:param2'))
	end

	def test_extract_uuid
		assert_equal( 'uuid', @responder.uuid('operator:uuid:param1:param2'))
	end

	def test_extract_params_as_int_values
		assert_equal( [ 1, 2], @responder.params('op:uuid:1:2'))
	end

	def test_calc_result_for_addition
		assert_equal( 6, @responder.calc_result('ADD:uuid:1:2:3'))
	end

	def test_calc_result_for_subtraction
		assert_equal( -4, @responder.calc_result('SUBTRACT:uuid:1:2:3'))
	end

	def test_calc_result_for_multiplication
		assert_equal( 24, @responder.calc_result('MULTIPLY:uuid:1:2:3:4'))
	end

	def test_generate_response
		assert_equal('uuidabc:6', @responder.generate_response('ADD:uuidabc:1:2:3'))
	end

end