fix AR tests for sqlite

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3896 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/fixtures.rb

@@ -533,7 +533,7 @@ module Test #:nodoc:
           ActiveRecord::Base.connection.rollback_db_transaction
           ActiveRecord::Base.unlock_mutex
         end
-        ActiveRecord::Base.clear_active_connections!
+        ActiveRecord::Base.verify_active_connections!
       end
 
       alias_method :teardown, :teardown_with_fixtures