Index: test/unit/helpers/application_helper_test.rb
===================================================================
--- test/unit/helpers/application_helper_test.rb	(revision 17151)
+++ test/unit/helpers/application_helper_test.rb	(working copy)
@@ -1344,6 +1344,7 @@
       assert_match tag_for_anonymous_re, avatar(nil)
       # Avatar for anonymous user
       assert_match tag_for_anonymous_re, avatar(User.anonymous)
+      assert avatar(User.anonymous, :size => 24).include?('width="24" height="24"')
     end
   end