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docs/building-and-running: Add note about updating ref-tests

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Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3465>
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Sebastian Wick 2023-12-19 15:08:49 +01:00 committed by Marge Bot
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@ -65,6 +65,15 @@ $ toolbox enter mutter
⬢ meson test -C builddir --print-errorlogs --suite mutter/tty
```
## Updating Ref-Tests
Ref-tests compare image captures of Mutter against a reference image. Sometimes a change of the rendering result is expected with some code changes. In those cases it's required to update the reference images. This can be done by running the tests with:
```sh
MESA_LOADER_DRIVER_OVERRIDE=swrast MUTTER_REF_TEST_UPDATE='/path/to/test/case'
```
This makes sure a software renderer is being used and the reference image of the test case `/path/to/test/case` is updated. More information is available in `src/tests/meta-ref-test.c`.
## Running a nested instance
While the test suite helps to catch mistakes, there are a lot of cases where we actually need to run and interact with Mutter. The least invasive method is running a "nested" instance.