My two favorite statistical test suites for PRNGs are PractRand and TestU01, but while they detect statistical flaws of many kinds, detecting those flaws often takes a long time to run, and for various reasons some flaws take a very long time to detect (if they are detected at all). In this post, we'll put together a test based around a very classic example from the world of probability theory, the Birthday Problem. In doing so, we'll develop a test that can detect deviations from random beha...
