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Add repeatability guarantees to faq.md

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Martin Hořeňovský 2022-11-16 11:21:00 +01:00
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@ -9,6 +9,8 @@
[What is Catch2's API stability policy?](#what-is-catch2s-api-stability-policy)<br>
[Does Catch2 support running tests in parallel?](#does-catch2-support-running-tests-in-parallel)<br>
[Can I compile Catch2 into a dynamic library?](#can-i-compile-catch2-into-a-dynamic-library)<br>
[What repeatability guarantees does Catch2 provide?](#what-repeatability-guarantees-does-catch2-provide)<br>
## How do I run global setup/teardown only if tests will be run?
@ -69,6 +71,24 @@ library on platforms that default to public visibility, or with tooling
support to force export Catch2's API.
## What repeatability guarantees does Catch2 provide?
There are two places where it is meaningful to talk about Catch2's
repeatability guarantees without taking into account user-provided
code. First one is in the test case shuffling, and the second one is
the output from random generators.
Test case shuffling is repeatable across different platforms since v2.12.0,
and it is also generally repeatable across versions, but we might break
it from time to time. E.g. we broke repeatability with previous versions
in v2.13.4 so that test cases with similar names are shuffled better.
Random generators currently rely on platform's stdlib, specifically
the distributions from `<random>`. We thus provide no extra guarantee
above what your platform does. **Important: `<random>`'s distributions
are not specified to be repeatable across different platforms.**
---
[Home](Readme.md#top)