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Update src/_pytest/hookspec.py 

Co-Authored-By: Bruno Oliveira <nicoddemus@gmail.com>
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Daniel Hahler 2020-04-02 12:01:43 +02:00 committed by GitHub
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src/_pytest/hookspec.py
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@ -170,7 +170,26 @@ def pytest_load_initial_conftests(early_config, parser, args):
def pytest_collection(session: "Session") -> Optional[Any]:
"""Perform the collection protocol for the given session.
The hook has to set `session.items` to a sequence of items.
Usually plugins will implement this hook only to perform some action before
collection, for example the terminal plugin will use this to start displaying
the collection counter, so usually plugins return `None` from this hook after
performing the desired operation.
However a plugin might decide to override the collection completely,
in which case it should return `True`, but then it is usually expected
that this hook will also need to perform the following operations
that are usually part of the collection process:
1. Call the pytest_collectstart hook.
2. Call the pytest_collectreport hook.
3. Call the pytest_collection_modifyitems hook.
4. Call the pytest_collection_finish hook.
5. Set session.testscollected to the amount of collect items.
6. Set `session.items` to a list of items.
If a plugin just wants to skip collection entirely, like `pytest-xdist`
does for master nodes, then it is OK to not do anything other than
returning `True` from here.
Stops at first non-None result, see :ref:`firstresult`.