Prevent warning messages

Author: mrkn

lib/iruby/session.rb

@@ -10,6 +10,7 @@ class Session
     def initialize(config, adapter_name=nil)
       @config = config
       @adapter = create_session_adapter(config, adapter_name)
+      @last_recvd_msg = nil
 
       setup
       setup_sockets

test/helper.rb

@@ -37,10 +37,14 @@ def self.test_config_filename
       @__config_path.to_s
     end
 
-    def teardown
+    def self.restore_kernel
       IRuby::Kernel.instance = @__original_kernel_instance
     end
 
+    def teardown
+      self.class.restore_kernel
+    end
+
     def with_session_adapter(session_adapter_name)
       IRuby::Kernel.new(self.class.test_config_filename, session_adapter_name)
       $stdout = STDOUT