Add missing fixtures (#33602).

git-svn-id: http://svn.redmine.org/redmine/trunk@20781 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/helpers/activities_helper_test.rb

@@ -22,6 +22,8 @@ require File.expand_path('../../test_helper', __FILE__)
 class ActivitiesHelperTest < Redmine::HelperTest
   include ActivitiesHelper
 
+  fixtures :projects, :members, :users
+
   class MockEvent
     attr_reader :event_datetime, :event_group, :name