Rename tests

Two failing rename tests:  these cases both expect behavior like core git.

I hate writing failing tests and not providing a patch to fix it, but I haven't had a chance to investigate this any further.  I think this is the opposite case of a previous failure - just with an opposite sort file sort order.

My approach would be to sort by similarities and evict entries once they're matched?  But I'm not certain that this is the superior approach.  My hope is that @arrbee could share some insight?