Test failure with SQLite3.

ActiveRecord::RecordNotUnique: SQLite3::ConstraintException: UNIQUE constraint failed: custom_fields_trackers.custom_field_id, custom_fields_trackers.tracker_id: INSERT INTO "custom_fields_trackers" ("custom_field_id", "tracker_id") VALUES (?, ?)


git-svn-id: http://svn.redmine.org/redmine/trunk@17739 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/functional/search_custom_fields_visibility_test.rb

@@ -29,7 +29,8 @@ class SearchCustomFieldsVisibilityTest < Redmine::ControllerTest
            :projects_trackers,
            :enabled_modules,
            :enumerations,
-           :workflows
+           :workflows,
+           :custom_fields, :custom_fields_trackers
 
   def setup
     field_attributes = {:field_format => 'string', :is_for_all => true, :is_filter => true, :searchable => true, :trackers => Tracker.all}