fixture_file_upload in Integration tests: is it been broken for two years?

Hi everyone,

I'm trying to test file uploads (with attachment_fu) in the integration tests for a rails 2.0.1 application, with code like:

  post :action, :data => fixture_file_upload('/image.png', 'image/ png')   assert_response :redirect

but this fails with a message NoMethodError (undefined method `content_type' for "#<ActionController::TestUploadedFile:0xb6f1a28c>":String):

because the TestUploadFile object is converted to a String with #to_s in #requestify (integration.rb about line 337). Obviously, attachment_fu shows this error but the string conversion problem is general.

I guess TestUploadedFile should be kept in the parameters hash as-is instead of being converted to #inspect-Strings.

I hope I'm doing something wrong (i.e. there is an argument to post that I'm missing). If not, shall it be specified in the documentation for fixture_file_upload that this does not work with integration tests? There has been a ticket about it for 2 years, now[1].

[1] http://dev.rubyonrails.org/ticket/4635