undefined method `tempfile'

bundle update

Using rake (0.9.2.2) 
Using activesupport (3.0.10) 
Using builder (2.1.2) 
Using i18n (0.5.0) 
Using activemodel (3.0.10) 
Using arel (2.0.10) 
Using tzinfo (0.3.33) 
Using activerecord (3.0.10) 
Using aasm (3.0.4) 
Using abstract (1.0.0) 
Using erubis (2.6.6) 
Using rack (1.2.5) 
Using rack-mount (0.6.14) 
Using rack-test (0.5.7) 
Using actionpack (3.0.10) 
Using mime-types (1.18) 
Using polyglot (0.3.3) 
Using treetop (1.4.10) 
Using mail (2.2.19) 
Using actionmailer (3.0.10) 
Using activeresource (3.0.10) 
Using ansi (1.4.2) 
Using bundler (1.1.3) 
Using cocaine (0.2.1) 
Using exception_notification (2.5.2) 
Using factory_girl (3.1.0) 
Using json (1.6.6) 
Using rdoc (3.12) 
Using thor (0.14.6) 
Using railties (3.0.10) 
Using factory_girl_rails (3.1.0) 
Using jquery-rails (1.0.19) 
Using minitest (2.12.0) 
Using mysql2 (0.2.18) 
Using net-ssh (2.3.0) 
Using net-sftp (2.0.5) 
Using newrelic_rpm (3.3.3) 
Using paperclip (3.0.1) 
Using progressbar (0.11.0) 
Using rails (3.0.10) 
Using rails3-jquery-autocomplete (1.0.6) 
Using ruby-prof (0.10.8) 
Using shoulda-context (1.0.0) 
Using shoulda-matchers (1.0.0) 
Using shoulda (3.0.1) 
Using turn (0.9.4) 
Using typed_serialize (1.0.0) 
Using will_paginate (3.0.3) 
Your bundle is updated! Use `bundle show [gemname]` to see where a bundled gem is installed.

factories.rb

FactoryGirl.define do
  factory :thingy do |f|                                                                                      
    f.csv { fixture_file_upload "/test.csv", "text/csv" }                                                                                                                                                                                
  end                                                                                                                                 
end

output

    ERROR test: a thingy should do stuff.  (0:00:00.260)
          undefined method `tempfile' for #<File:/tmp/test.csv20120410-12205-ldmfez>
        @ /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/rack-test-0.5.7/lib/rack/test/uploaded_file.rb:40:in `method_missing'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/paperclip-3.0.1/lib/paperclip/io_adapters/uploaded_file_adapter.rb:5:in `initialize'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/paperclip-3.0.1/lib/paperclip/io_adapters/registry.rb:29:in `new'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/paperclip-3.0.1/lib/paperclip/io_adapters/registry.rb:29:in `for'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/paperclip-3.0.1/lib/paperclip/attachment.rb:91:in `assign'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/paperclip-3.0.1/lib/paperclip.rb:193:in `block in has_attached_file'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/attribute_assigner.rb:14:in `block (2 levels) in object'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/attribute_assigner.rb:13:in `each'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/attribute_assigner.rb:13:in `block in object'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/attribute_assigner.rb:12:in `tap'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/attribute_assigner.rb:12:in `object'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/strategy/create.rb:9:in `result'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/factory.rb:38:in `run'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/factory_runner.rb:21:in `run'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/factory_girl-3.1.0/lib/factory_girl/syntax/methods.rb:63:in `create'
          test/unit/thingy_test.rb:6:in `block (3 levels) in <class:ThingyTest>'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/shoulda-context-1.0.0/lib/shoulda/context/context.rb:398:in `call'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/shoulda-context-1.0.0/lib/shoulda/context/context.rb:398:in `block in create_test_from_should_hash'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.0.10/lib/active_support/testing/setup_and_teardown.rb:35:in `block in run'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:419:in `_run_setup_callbacks'
          /home/tony/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.0.10/lib/active_support/testing/setup_and_teardown.rb:34:in `run'

thingy_test.rb

require 'test_helper'                                                                                                                 
                                                                                                                                      
class ThingyTest < ActiveSupport::TestCase                                                                                            
  context "a thingy" do                                                                                                               
    should "do stuff" do
     t = create(:thingy)
    end
  end
end