To add a bit to the excellent reply by Huseng....it is absolutely true the interium result of the spiritual path is increased happiness and release from many many sufferings. All who follow Buddhism regardless of particular school could attest firmly to that as fact. Essentially Buddhism in its foundational core emphesizes compassion. With increased compassion and compassionate effect, comes human happness....that is undeniable. Buddhism provides that result.
As to the second part.."But I have never heard anyone testify the opposite. That is "enlightenment is real! I am awakened!" because if they did, how would we react?"
As a point of logic, since logic is mentioned, a I, or individual, never becomes factually enlightened. A buddha, the teacher buddha, that lived 2.5k years ago, was once asked what he was...was he this, was he that, was he human....his response was...he was awake.
At core to Buddhism is the notion of dissolution of self concept and self other determination as expressed in a foundational teacheing the 12 links of dependent origination. So basically in this field you essentially never have a individual attaining a completely enlightened state as the enlightened state is effect of consideration of noninherant existant quality and.or nonself hood. So thusly in this aspect buddhism differs. The quesstion posed is actually a impossible one logically considered in the context of buddhism.
A I, never becomes enlightened. Perhaps your friend was mistaken on his concept of such things.
To mention as qualifier to my statements...I am but a layperson with little understanding of things and no spiritual accomplishment of any sort. For your consideration. So my replies are of that sort, which may be similiar to your level of understanding of this thing...so that may actually be a benefit. But I am by no means a authority on things buddhist. I do study, and practice buddhist things... that is about it.
To the second part of the second part..how would one/we react? In a buddhist context we would react most probably, as our tendency, our inherant habitual tendency, to react to such things, would dictate, with some personal variance. The Buddha upon becomeing enlightened(in the nonself context I describe) pretty immediately met a person on a trail in the foreest, who saw him, stopped, and then kept on walking. He came upon his fellow meditators who were ascetics, and initially they thought him strayed and were to treat him with distain. Upon coming closer they saw the buddha had certain perceptable qualities about him which spoke of unspoken understandings....so they prostrated before him. A cousin of the buddha tried in fact to kill him with a bolder.....so the response to a enlightened person may vary.
More is our response to one seemingly a tale of ours, not theirs. Like a stone or river we may come upon in a forest.... they are as they are. How we are.... determines the result of the circumstance of our encounter with them, most commonly.
"This order considers that progress can be achieved more rapidly during a single month of self-transformation through terrifying conditions in rough terrain and in "the abode of harmful forces" than through meditating for a period of three years in towns and monasteries"....Takpo Tashi Namgyal.