Adding unit tests to the Array Core Extension

As I get more familiar with legato, I would like to start getting some basic unit tests around the core extensions that are used if `ActiveSupport` is not available.

This tests the `Array.wrap`

* When an object is nil
* When an object does not have `to_ary` defined
* When an object has `to_ary` defined
* General methods handling some of the different types (hash, integer, float, string, array, etc)