Need help testing SRFI-194: Random data generators

[noosphere]

I've almost completed packaging up SRFI-194 for Chicken 5, with only the
tests left to do.

I'm stumped by one test:

  
https://github.com/diamond-lizard/srfi-194/blob/0abe0402cdcdbbe8463154152c8f6d550be06cc6/tests/srfi-194-test.scm#L98

The comments to this test say "testing random source, which is
implementation specific", and it only provides a single
test for the Guache Scheme implementation.

Would anyone more experienced in dealing with randomness on Chicken be
able to provide me with a good Chicken test to substitute for this
Guache test?

My own skills aren't up to the task.

Thanks in advance for any help,

  --Sergey