Guild Wars 2

I own GW2 already and I was thinking about buying the expansion, and I was wondering if I get a code for the base game and a code for the expansion because I want to give the base game code to my friend to see if he likes the game before he buys the expansion.

It does not.

You have two choices:

Upgrade your existing account with the key

or

Create a new account with the key

Good luck.

Nope, it gives a single code.