The Notebook of Reality

Naruto was annoyed when he woke up and saw the black spiral notebook had hit him in the head despite the fact that no one was around. He went to pick it up as he held the book and saw it was called the Notebook of Reality. He was tempted to see as that weather this was a prank or the real deal, despite the fact he doubted it was real and decided to test and no one would get away with pranking him as he was a prank master. But how should he test it?