system
Given the following post, respond as if you're commenting on Reddit:
human
[Modern day magic] What would be a responsible way of evaluating my new superpower?

By sheer cosmic coincidence, I found out I can "heal wounds" after I reflexively gripped at a scratch i received. I saw that the injury had broken my skin and drawn blood, but after I had applied pressure to the area and released my grip, there was no such injury. 

I assumed this was just warped perception at the time, until another instance of injury occured, where I absentmindedly cut my finger during meal prep. Same deal; dropped the knife and put pressure on the wound, then realized it wasnt there anymore as I went to grab a bandage.

Now here's the thing. I don't know what's happening exactly to undo wounds, or the limitations of it's activation. I can't tell if it's rapid cellular regeneration, a localized time reversal, or what; and I'm honestly not keen on testing the extent of this phenonenon on myself should it lead to giving myself super cancer or something. Nor would people be jumping at the idea of being human lab rats lest the same happen to them. 

While this is pretty benign so far, both activations have been unconscious. I'm not keen on waking up one day to find out it had spiraled out of control and turned me into a massive tumor; but I also don't want to end up locked up in a research facility where I'm doomed to just suffer through experiments as a test subject. 

I'd like to at least find the extent to which this ability works, or if I can even consciously control it, without stirring up unwarranted attention. How do?
gpt
The easiest way would probably be to try it out on animals.

Buy some literal lab rats and try it on them.  Wound them, slightly at first, but then more severely, testing your ability to heal them and observing for after-effects each time.

Realise that rats are pretty small, and you're not accounting for potential complications with larger animals.  Buy a cat, then a dog, and experiment with them.  Buy a bird, a lizard, and some fish, so you're not just testing with mammals.  Continue hurting and healing them, until one day you go too far and kill one of them.  In a panic, attempt to heal them and discover to your surprise that you're successful; what's more, the subject experiences no apparent ill-effects apart from the obvious, expected fear of you.

Realise that the horror of killing a living, breathing, tail-wagging, cute little puppy and the subsequent thrill of bringing it back to life was the most intense rush you ever felt.  Begin to test this ability exclusively, inflicting increasingly more grotesque and catastrophic - but always fatal - damage each time and finding to your delight that you can bring them back in every scenario.  Blunt force trauma; evisceration; fire; extreme cold; starvation; your abilities overcome them all. The killing and the resurrecting get mixed up in your mind, until you no longer know which of the two thrills you the most.

Eventually, come to the conclusion that animals aren't enough: yes, you can _observe_ them, but you can't really understand what they're experiencing; what's really _happening_ to them when you revoke, then restore, the gift of life. Start scoping the area for homeless people, junkies and/or runaways.  Abduct them and subject them to endless inventive deaths, resurrecting them each time and interrogating them for data: how much did it hurt to die? What was it like being dead? Did they see anything beyond the veil? Did it hurt more or less than the last ten, fifty, one hundred times? Would they agree that you are, if not _the_ God, then at least _a_ god?  Are they suitably appreciative of the miracle you're allowing them to share?

Congratulations - you are now a supervillain, and a particularly nasty one at that.