How to test production push notifications?

The production push will work when you download the app from the App Store.

UPDATE:
You can also test the production push with an AdHoc build of the app; see Trinca's answer.

UPDATE:
Now, the easiest solution is to use Apple's TestFlight. (In TestFlight, it is easy to add new remote users, sending them an email invitation, they then download on whatever device they choose.)

Create an Adhoc distribution profile for your app in provisioning profile. Download profile and install. Choose the Adhoc dist profile to code sign your app. Archive ipa and save for adhoc distribution. Copy ipa to your device and test push. It will use production push certs as opposed to development cert. Hope this helps.

You can test APNS production environment building an AdHoc version of your App. The app will be using the production certificates and servers and it's purpose is exactly to test BEFORE you send it to AppleStore.

Take a looke at this link: what kind of certificate do I need to test apns using ad-hoc distribution?