In theory, version exchange for client and server works now.

Test rig isn't there yet, so untested at the moment.

Added a simple README

spec/em-bitcoin_spec.rb

@@ -0,0 +1,78 @@
+require 'spec_helper'
+require 'em-bitcoin'
+
+
+include ::EM::P
+
+class MockActor
+  attr_accessor :connection
+
+  def network_name   ; :main    ; end
+  def current_time   ; Time.now ; end
+  def sub_version    ; nil      ; end
+  def current_height ; 0        ; end
+
+  def log(level, msg)
+    STDERR.puts("#{level}: #{msg}") if $DEBUG
+  end
+  
+  def ready!
+    @ready = true
+  end
+  
+  def ready?
+    @ready == true
+  end
+  
+end
+
+class MockSignature
+  attr_reader :lip, :lport, :rip, :rport
+  
+  def initialize(lip = "127.0.0.1", lport = 12701, rip="127.0.0.2", rport=12702)
+    @lip, @lport, @rip, @rport = lip, lport, rip, rport
+  end
+end
+
+module EMPMocks
+  def get_peername
+    Socket::pack_sockaddr_in(@signature.rport, @signature.rip)
+  end
+  
+  def get_sockname
+    Socket::pack_sockaddr_in(@signature.lport, @signature.lip)
+  end
+  
+  def send_data(d)
+    nil # TODO: expectations &c...
+  end
+end
+
+shared_examples_for BitcoinPeer do
+end
+
+describe BitcoinClient do
+  before(:each) do
+    @reactor = stub("reactor")
+    @sig = MockSignature.new
+
+    @actor = MockActor.new
+    @client = BitcoinClient.new(@sig, @actor)
+    @client.extend(EMPMocks)
+  end
+  describe "connection setup" do
+    context "successful" do
+      it "should accept a valid actor" do
+        @client.actor.should == @actor
+      end
+
+      it "should send a version first, accept a verack + version, then send a verack"
+    end
+  end
+  
+  
+end
+
+describe BitcoinServer do
+end
+