The universe was built by aliens. We're in a simulation.
>How can we test this?
YOU can't. because you are being simulated. Only I can test it, because I run the simulation.
No shit, make with the cheeseburgers, motherfucker, chop chop!
And I simulate you because I'm lazy and stoned! But you are right in a sense, but remember life goes one, even for you with the knowing that you have no control over your life! But on the other hand, the meaning of a simulation is to find out something new and with this in mind you have a small gape between given rules and free will. The gape of your possible actions is: the limitations of your body, the limitations of your imagination and finally your environment which will kill you when you go over your boundaries. With all this variables of the simulation You can change as you like, you can make a pretty good vacation from eternity which means : life is just a game, learn the rules and play hardcore!