fixed Webrat::MechanizeSession - calling visit on a newly created session was failing. Default headers were not set and Webrat::Session#request_page would fail when Webrat::Session#headers was called - dup was being called on the nil headers

lib/webrat/mechanize/mechanize_session.rb

@@ -2,6 +2,7 @@ module Webrat
   class MechanizeSession < Session
     
     def initialize(mechanize = WWW::Mechanize.new)
+      super()
       @mechanize = mechanize
     end
     

spec/webrat/mechanize/mechanize_session_spec.rb

@@ -0,0 +1,13 @@
+require File.expand_path(File.dirname(__FILE__) + "/../../../lib/webrat/mechanize")
+
+describe Webrat::MechanizeSession do
+  before(:each) do
+    @mech = Webrat::MechanizeSession.new
+  end
+  
+  describe "headers method" do
+    it "should return empty headers for a newly initialized session" do
+      @mech.headers.should == {}
+    end
+  end
+end