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Parameter random instructs the Unit Test Framework to execute the test cases in random order. This parameter accepts an optional unsigned integer argument for the seed of the random generator:

[Tip] Tip

in case --random is specified, the value of the seed is logged using BOOST_TEST_MESSAGE, so that it is possible to replay exactly the same sequence of unit test in case of failure. For the seed to be visible in the logs, make sure the proper --log_level is set.

Acceptable values
Command line syntax
Environment variable