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fixtures: change --fixtures/--fixtures-per-test to call pytest_collection hook instead of collecting directly #15050

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fixtures: change --fixtures/--fixtures-per-test to call pytest_collection hook instead of collecting directly #15050

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2 changes: 2 additions & 0 deletions changelog/15049.breaking.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
When :option:`--fixtures` or :option:`--fixtures-per-test` are used, the :hook:`pytest_collection` hook is now called to perform the collection.
Previously, these two modes performed the collection directly, bypassing the hook.

@nicoddemus nicoddemus Sep 18, 2026 •
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Someone reading this might wonder "where is the breaking change?", because it is non-obvious. Perhaps mention why this might break something, just to clarify the entry.

6 changes: 4 additions & 2 deletions src/_pytest/fixtures.py
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Expand Up @@ -2450,7 +2450,8 @@ def _get_fixtures_per_test(test: nodes.Item) -> Iterator[FixtureDef[object]]:
def _show_fixtures_per_test(config: Config, session: Session) -> None:
import _pytest.config

session.perform_collect()
config.hook.pytest_collection(session=session)

invocation_dir = config.invocation_params.dir
tw = _pytest.config.create_terminal_writer(config)
verbose = config.get_verbosity()
Expand Down Expand Up @@ -2505,7 +2506,8 @@ def showfixtures(config: Config) -> int | ExitCode:
def _showfixtures_main(config: Config, session: Session) -> None:
import _pytest.config

session.perform_collect()
config.hook.pytest_collection(session=session)

invocation_dir = config.invocation_params.dir
tw = _pytest.config.create_terminal_writer(config)
verbose = config.get_verbosity()
Expand Down