If you really need to, create a PayPal account for Apple to test with. You can deposit some minimal amount if need be. Once your app is approved, change the password.
Since the amount will be deposited in your merchant account, you wouldn't really loose the money. (You can also log in to your merchant account and refund the transaction if need be.)
NOTE: Do NOT give out your merchant account info; The transaction will fail if buyer == seller, and you really don't want to give anyone else access to your core business account anyway.