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Make testing random things a bit more deterministic
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README

NAME
    Test::Random - Make testing random functions deterministic

SYNOPSIS
        use Test::Random;

        ... test as normal ...

DESCRIPTION
    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.

        TEST_RANDOM_SEED=12345 perl -Ilib t/some_test.t

    Test::Random will output the seed used at the end of each test run. If
    the test failed it will be visible to the user (ie. on STDERR) otherwise
    it will be a TAP comment and only visible if the test is run verbosely.

    If having new data every run is too chaotic for you, you can set
    TEST_RANDOM_SEED to something which will remain fixed during a
    development session. Perhaps the PID of your shell or your uid or the
    date (20090704, for example).

EXAMPLE
    When you run a test with Test::Random you will see something like this:

        perl some_test.t

        1..3
        ok 1
        ok 2
        ok 3
        # TEST_RANDOM_SEED=20891494266

    If you wish to repeat the circumstances of that test, with the same
    randomly generated data, you can run it again with the
    "<TEST_RANDOM_SEED"> environment variable set to the given seed.

        TEST_RANDOM_SEED=20891494266 perl some_test.t

        1..3
        ok 1
        ok 2
        ok 3
        # TEST_RANDOM_SEED=20891494266

    See your shell and operating system's documentation for details on how
    to set environment variables.

CAVEATS
    If something in your code calls srand() all bets are off.

SEE ALSO
    Test::RandomResults, Test::Sims, Data::Random, Data::Generate

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