Add pytest-xvfb as test dependency #23231
Merged
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PR Summary
With this, there is no need to explicitly start xvfb (program to "get a display" when running without a display, such as on the CI). When running tests locally and xvfb is installed, no windows will pop up.
For options to actually pop up the windows and more info, see https://github.com/The-Compiler/pytest-xvfb/
Helps with #23096 (if on Linux and xvfb installed...).
PR Checklist
Tests and Styling
pytest
passes).flake8-docstrings
and runflake8 --docstring-convention=all
).Documentation
doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).