yeah, see https://github.com/mozilla-b2g/gaia/pull/16377/files#diff-d3f17b4905e6f17ad136aabbdc262db9R3518

the diff makes it difficult to see, here is the full code:

https://github.com/julienw/gaia/blob/881469-navigation-object/apps/sms/test/unit/thread_ui_test.js#L3518-L3566