It's trivial to pass the first two requirements by changing the property/object name, so they aren't enforced at all.

You aren't using the ToyShop.prototype

Well, instance methods should stay in the prototype because this is the best practice. Assigning them to the object every time creates new functions for every instance, and every instance needs to be modified if you need to change one of them.

You're asking us to refactor into a worse design. This is a bad idea.

I think toyShop = new ToyShop() is really misleading.
Unlike mine, your solution is not a constructor. After your refactoring, toyShop is no longer an instance of ToyShop.

edit: Just to be more clear, I made this comment because not requiring ToyShop to remain a constructor decreases the difficulty of this kata significantly.

Nice! Thanks, my attempts to fix the testing holes are not as slick as this solution

I'm going to add another test ;)

Tim!!! You rockstar :) All good

This is a hard one to test for. I cheated pretty hard. How's it going stujo?!