assert_valid is deprecated in unit tests but not in functional tests

To "deprecate" means to schedule a piece of functionality for removal in a future version and issue a warning when its used to make people aware that they will not be able to use it sooner or later.

assert_valid does not exist in ActiveSupport::TestCase but it's scheduled to be removed from ActionController::TestCase. This ticket can be marked as invalid.

David's right, they'll still be available but should be raising deprecation warnings.