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我在涉及回形針和附件的功能測試中遇到問題。我正在使用fixture_file_upload方法來僞造附件上傳。回形針和功能測試問題（導軌）
我的測試間歇性地給我下面的錯誤（或類似於它的錯誤），由factory_girl調用生成包含附件的對象，該附件位於我的設置塊中。
@asset = Factory(:asset, :item => fixture_file_upload('test.png','image/png'))
但是，即使設置塊在最終的每個測試中都運行，每個測試都不會生成此錯誤。在文件中運行單個測試（調用setup塊和上述方法）運行良好。這只是多個測試，我得到的錯誤（它並不總是相同的取決於運行多少測試）。所以有一些與fixture_file_upload多次調用衝突。
任何人有任何想法如何解決這個問題？謝謝。
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/Users/francis/.rvm/rubies/ruby-1.9.2-preview3/lib/ruby/1.9.1/fileutils.rb:1407:in `stat'
/Users/francis/.rvm/rubies/ruby-1.9.2-preview3/lib/ruby/1.9.1/fileutils.rb:1407:in `block in fu_each_src_dest'
/Users/francis/.rvm/rubies/ruby-1.9.2-preview3/lib/ruby/1.9.1/fileutils.rb:1423:in `fu_each_src_dest0'
/Users/francis/.rvm/rubies/ruby-1.9.2-preview3/lib/ruby/1.9.1/fileutils.rb:1405:in `fu_each_src_dest'
/Users/francis/.rvm/rubies/ruby-1.9.2-preview3/lib/ruby/1.9.1/fileutils.rb:504:in `mv'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip/storage.rb:42:in `block in flush_writes'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip/storage.rb:38:in `each'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip/storage.rb:38:in `flush_writes'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip/attachment.rb:144:in `save'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip.rb:384:in `block in save_attached_files'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip.rb:377:in `block in each_attachment'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip.rb:376:in `each'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip.rb:376:in `each_attachment'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/paperclip-2.3.3/lib/paperclip.rb:383:in `save_attached_files'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activesupport-3.0.0.beta4/lib/active_support/callbacks.rb:429:in `_run_save_callbacks'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/callbacks.rb:290:in `create_or_update'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/persistence.rb:53:in `save!'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/validations.rb:46:in `save!'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/attribute_methods/dirty.rb:30:in `save!'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:240:in `block in save!'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:287:in `block in with_transaction_returning_status'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:202:in `transaction'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:285:in `with_transaction_returning_status'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:240:in `save!'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/factory_girl-1.3.1/lib/factory_girl/proxy/create.rb:6:in `result'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/factory_girl-1.3.1/lib/factory_girl/factory.rb:326:in `run'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/factory_girl-1.3.1/lib/factory_girl/factory.rb:270:in `create'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/factory_girl-1.3.1/lib/factory_girl/factory.rb:301:in `default_strategy'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/factory_girl-1.3.1/lib/factory_girl.rb:20:in `Factory'
/Users/francis/dev/r3/works/test/functional/assets_controller_test.rb:13:in `block in <class:AssetsControllerTest>'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activesupport-3.0.0.beta4/lib/active_support/callbacks.rb:433:in `_run_setup_callbacks'
/Users/francis/.rvm/gems/ruby-1.9.2-preview3/gems/activesupport-3.0.0.beta4/lib/active_support/testing/setup_and_teardown.rb:34:in `run'