Statistics::test::randomwalk implements a random walk test of a random number generator as outlined in blobel et al. basically, it tests that the numbers (in the interval between 0 and 1) generated by a random number generator are distributed evenly. it divides [0,1] into n evenly sized bins and calculates the number of expected and actual random numbers in the bin. (in fact, this counts the cumulated numbers, but that works the same.)