When a client makes a copy of the "live" store for testing. The copy is not an exact copy. The newly created store will only have the templates.
The categories, products, and custom features of the live site will not be copied to the new store. In order to use the test store you would need to import or build all of the categories and products as well as any custom work done outside of the templates.
A developer has the ability to make an exact copy of the "Live" store and you can submit a request for a quote for this option.