Say I have designed a makeshift PRNG for my personal amusement, now I would like to see how good it is. How do I benchmark its "randomness"? Ideally, I want to know a statistics test, such that if I pass it (or get a high score) I can write up a paper to announce a new state-of-the-art PRNG to the world. Yeah I know that's unlikely, but by saying this I mean I expect a really "strict" test.
I did some searching and Wikipedia points me to TestU01, which is said to be state-of-the-art, but its latest release is in 2009, or nearly ten years ago. I suppose a lot of things have happened since then.