And yet science is responsible for everything you enjoy in life today. Exclusively!
Science is why you get to be on the internet, mass produced your bible, delivered you into the world, made every thread you wear and sleep on, put all your food on the shelf, is why you have a toilet to flush!
Without science you might as well go back to living in the woods.
That said. You're wrong. But you already know that.
Science can in fact test itself. In fact that's part of the process for discovering if the tests were done well in the first place. I suppose there still a chance this might all be a lie like we're living in the matrix or something but that doesn't sound very probable to me.
That said I'm going to reiterate myself. Science can't test any action that defies the laws of reality/physics. Anything that's actually real leaves evidence that can be tested in the perceivable universe. Anything that leaves evidence can be tested to learn about it's properties. If something supernatural does exist, then how can science determine it's properties? If miracles do occur then how can science test their properties? If they have properties then they're real and not supernatural or miraculous anymore since the definition explicitly pertains to things that defy the laws of physics. Any such things that does not defy these laws fails to fit that definition.