Added wait_for_socket_close definition and call in order to ensure th…

…at the app server we've started has exited.

lib/webrat/selenium/application_servers/base.rb

@@ -15,6 +15,7 @@ def boot
         def stop_at_exit
           at_exit do
             stop
+            wait_for_socket_close
           end
         end
 
@@ -34,6 +35,17 @@ def wait_for_socket
           rescue SocketError
           fail
         end
+
+        def wait_for_socket_close
+          silence_stream(STDOUT) do
+            TCPSocket.wait_for_service_termination_with_timeout \
+              :host => "0.0.0.0",
+              :port => Webrat.configuration.application_port.to_i,
+              :timeout => 30
+          end
+        rescue SocketError
+          true
+        end
 
         def prepare_pid_file(file_path, pid_file_name)
           FileUtils.mkdir_p File.expand_path(file_path)