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Clarify conftest hook timing before collection #14563

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Clarify conftest hook timing before collection #14563

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1 change: 1 addition & 0 deletions changelog/14557.doc.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Clarified that conftest files discovered during collection are not available for hooks which run before collection, such as :hook:`pytest_sessionstart` and :hook:`pytest_report_header`.
5 changes: 5 additions & 0 deletions doc/en/how-to/writing_plugins.rst
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Expand Up @@ -59,6 +59,11 @@ Plugin discovery order at tool startup
After a ``conftest.py`` file is loaded, recursively load all plugins specified
in its :globalvar:`pytest_plugins` variable if present.

These initial conftest files are loaded before collection starts. Conftest
files discovered later during collection can still implement hooks, but they
are not available for hooks which run before collection, such as
:hook:`pytest_sessionstart` and :hook:`pytest_report_header`.


.. _`conftest.py plugins`:
.. _`localplugin`:
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