[Rails 3.2.5] Rails: unit test fixture_path : fixture_file_upload cannot find the file ...

I am trying to perform a test unit, using FactoryGirl

include ActionDispatch::TestProcess FactoryGirl.define do   factory :article do     .......     photo { fixture_file_upload '/files/test.jpg', 'image/jpg' }   end end

IN mt test_helper.rb I defined the fixture_path

  def fixture_path     File.dirname(__FILE__) + "/fixtures/" # "..../myapp/test/ fixtures/"   end

and I have my test.jpg in "..../myapp/test/fixtures/files/ test.jpg"

but running the unit test, article = FactoryGirl.build(:article, title: nil), I get an error : RuntimeError: files/test.jpg file does not exist

where should I put the file for 'fixture_file_upload' can find it ?

thanks for feedback

I looked into : actionpack/lib/action_dispatch/testing/ test_process.rb

    def fixture_file_upload(path, mime_type = nil, binary = false)       fixture_path = self.class.fixture_path if self.class.respond_to? (:fixture_path)       Rack::Test::UploadedFile.new("#{fixture_path}#{path}", mime_type, binary)     end

it's trying to get the fixturePath from self.class ( Article in this case) which doesn't respond to fixture_path however the correct path is given by ActionController::TestCase.fixture_path

so using the trick:      photo { fixture_file_upload "#{ActionController::TestCase.fixture_path}files/test.jpg", 'image/ jpg' } runs well... but I guess it's just a trick, the 'truth' is somewhere else ..... ? how can I relate the fixture_path with the self.class

thanks for your feedback