How Do I test Promo Code in TNEW from TEST Environment?

This is our first time using a promo code for online sales. I think I built it correctly (I used every piece of documentation the Help System had). The problem is I did all the work in our TEST environment and I'd like to test and see if it worked in TNEW before transferring it over to PROD. Is there a way of doing that? Or do I have to have it in PROD before I can TNEW test it? 

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