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Document the stability guarantees of '--order rand' option

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Martin Hořeňovský 2022-04-25 21:43:10 +02:00
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docs/command-line.md
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@ -334,13 +334,19 @@ Lexicographic order. Tests are sorted by their name, their tags are ignored.
### rand
Randomly sorted. The order is dependent on Catch2's random seed (see
Randomly ordered. The order is dependent on Catch2's random seed (see
[`--rng-seed`](#rng-seed)), and is subset invariant. What this means
is that as long as the random seed is fixed, running only some tests
(e.g. via tag) does not change their relative order.
> The subset stability was introduced in Catch2 v2.12.0
Since the random order was made subset stable, we promise that given
the same random seed, the order of test cases will be the same across
different platforms, as long as the tests were compiled against identical
version of Catch2. We reserve the right to change the relative order
of tests cases between Catch2 versions, but it is unlikely to happen often.
<a id="rng-seed"></a>
## Specify a seed for the Random Number Generator