Sorry about this comment, I feel such a shame. I have a very bat habit with comments...

Anyway, does the test case in itself (without this shameful comment) respects your standards ? 

To sum up the test :

 - given we have a collection with 3 items
 - given the collection has a comparator
 - given it is rendered in the dom
 - when we add a model in the middle of the collection (respecting the backbone's comparator)
 - it should be added in the dom in the middle (the correct position)

the spec currently fails. I followed the contributor guide that says you better have a failing spec as a pull request rather than a bunch of modified code without tests.

Also, tbh, I was high at the time of this pull request (explaining this weird comment).