This is a testing module to make testing random things a bit more
deterministic.

Controlling randomness
Its main function is to allow you to repeat a failing test in the same
way it ran before, even if it contained random elements. Test::Random
will output the seed used by the random number generator. You can then
use this seed to repeat the last test with exactly the same random
elements.

You can control the random seed used by Test::Random by setting the
'TEST_RANDOM_SEED' environment variable. This is handy to make test
runs repeatable.