fix test

collection expects:
 - to have an object (array/traversable) and hydrator, or
 - that its target element have an object (allows binding) and hydrator

to be able to extract the values from the object bound to it

previously the collection was being assigned a hydrator. with that gone,
we now have to assign an object and a hydrator to its target element.
Merge pull request #1 from radnan/pull-5746

fix test