Added a test for Attachment#uploaded_file

lib/paperclip/attachment.rb

@@ -95,7 +95,7 @@ module Paperclip
         uploaded_file = uploaded_file.to_file(:original)
         close_uploaded_file = uploaded_file.respond_to?(:close)
       else
-        instance_write(:uploaded_file, uploaded_file)
+        instance_write(:uploaded_file, uploaded_file) if uploaded_file
       end
 
       return nil unless valid_assignment?(uploaded_file)

test/attachment_test.rb

@@ -825,6 +825,10 @@ class AttachmentTest < Test::Unit::TestCase
             assert @attachment.dirty?
           end
 
+          should "set uploaded_file for access beyond the paperclip lifecycle" do
+            assert_equal @file, @attachment.uploaded_file
+          end
+
           context "and saved" do
             setup do
               @attachment.save

test/helper.rb

 require 'rubygems'
 require 'tempfile'
+require 'pathname'
 require 'test/unit'
 
 require 'shoulda'