Test for the random number generator

[avramidis]

Is your feature request related to a problem? Please describe.
There isn't a test for the random number generator. The library for the generation of the random number is Random123 which is reliable, however, it would be good test that for different OpenCL devices.

Describe the solution you'd like
A test function that test that the random number generator generates random number with the distribution characteristics required (i.e. uniform and normal). A statistical test can be used for that. For example, the scipy.stats.kstest can be used for that.