"enumerate all pizza sizes and how they relate to each other"

I get that, but I was thinking that the "name" of the pizza isn't really relavant to the size of the pizza as that's defined by the diameter of the pizza. Even if the best deal is called "Alabaster eclipse", then that doesn't really matter because the size is defined in the object, not by the name. I'll make that clearer in the explanation and provide a test example with unusual names.

"mention that the pizza objects will not be in a guaranteed order"

That is a good point. Done.

"change the order of pizza objects within a basic test"

Good point. Done.