In simple words, perfume tester is actually meant for trials at any big shopping stores. These allow the visitors to employ the scent and know what it would smell like on them. Tester perfume is the very same fragrance as its labels mention. However, as they are not available for sale, it is likely you will not find the same decoration done for it as will be done for the regular perfume bottle.
It is not confirmed actually whether or not the testers are original. As a matter of fact, the tester perfume is there to showcase and appeal to the customer. So, it is most likely that the scent will be the exact one or even better. In general, it is in the exact same form as the item would be. In fact the fragrance bottle too, looks the same so individuals are attracted towards it.