Fix bug caused by fixture_file_upload reading from ActionController::…

…TestCase instead of self.class.

- This should also be fixed in rails-3.1
  - rails/rails#1861
- Fixes #252

lib/rspec/rails/fixture_support.rb

@@ -9,6 +9,17 @@ module FixtureSupport
         include ActiveRecord::TestFixtures
 
         included do
+          # TODO (DC 2011-06-25) this is necessary because fixture_file_upload
+          # accesses fixture_path directly on ActiveSupport::TestCase. This is
+          # fixed in rails by https://github.com/rails/rails/pull/1861, which
+          # should be part of the 3.1 release, at which point we can include
+          # these lines for rails < 3.1.
+          ActiveSupport::TestCase.class_eval do
+            include ActiveRecord::TestFixtures
+            self.fixture_path = RSpec.configuration.fixture_path
+          end
+          # /TODO
+
           self.fixture_path = RSpec.configuration.fixture_path
           self.use_transactional_fixtures = RSpec.configuration.use_transactional_fixtures
           self.use_instantiated_fixtures  = RSpec.configuration.use_instantiated_fixtures