[cttet]

In the wikipedia page you mentioned it stated: "Under the assumption of finite computational resources, the simulation of the universe would be performed by dividing the continuum space-time into a discrete set of points." How will we know if this assumption is correct? If the beings that run the experiment have higher intelligence, they may successfully hide all the evidence of simulation and we may never find the constraints.

Unless we reduce the simulation hypothesis to "Beings of similar intelligence level as us running similar computer simulations that we do in the late 20th and early 21st century", then it is testable.