Cannot use pytest.mark.usefixtures() in pytest.param

Adding Fixtures to a parametrization of a test function via pytest.mark.usefixtures has no effect. The fixtures are not executed and are missing from request.fixturenames.

Example:

import pytest

@pytest.fixture
def c():
    return []

@pytest.fixture
def a(c):
    c.append('a')

@pytest.fixture
def b(c):
    c.append('b')

@pytest.mark.parametrize('expected', [
    pytest.param(['a'], marks=pytest.mark.usefixtures('a'), id='a'),
    pytest.param(['b'], marks=pytest.mark.usefixtures('b'), id='b'),
])
def test_usefixtures_param(request, c, expected):
    assert c == expected

$ pip list
Package        Version
-------------- -------
atomicwrites   1.2.1  
attrs          18.2.0 
more-itertools 4.3.0  
pip            18.1   
pluggy         0.7.1  
py             1.6.0  
pytest         3.8.2  
setuptools     40.4.3 
six            1.11.0 
wheel          0.32.1

linking #349 (comment) as it has some more details on the problem

I think I have same problem. Specified fixture as argument for pytest.mark.usefixture will be ignored if this specified fixture has params.

import pytest

@pytest.fixture
def data():
    return dict()


@pytest.fixture(params=[1, 2])
def add_data(request, data):
    data['a'] = request.param


@pytest.mark.usefixtures('add_data')
@pytest.fixture
def completed_data(data):
    data['b'] = 3
    return data


def test_data(completed_data):
    assert 'a' in completed_data

I expect add_data must be executed before start completing completed_data but it does not.
Also it work (how am I expect) if specify add_data in define of completed_data:

@pytest.fixture
def completed_data(data, add_data):
    data['b'] = 3
    return data

Please say me if I'm wrong.

marks on fixtures are NOT supported and won't be

Fix:Cannot use pytest.mark.usefixtures() in pytest.param pytest-dev/p…

Dev,Fix:Cannot use pytest.mark.usefixtures() in pytest.param pytest-d…

@dtomas

linking #349 (comment) as it has some more details on the problem

Just for reference, here is the code @dtomas linked to in their original comment: https://github.com/pytest-dev/pytest/blob/3.9.0/src/_pytest/python.py#L418-L421

Posting this link here since @dtomas's original comment didn't pin the code link to a specific git version or hash. It now points to some unrelated code.

It looks like that there is still no support on adding pytest.mark.usefixtures to marks of pytest.param. Are there any news on that?

@DenisKuplyakov

@DenisKuplyakov I'm not aware of anyone working on this. If there were any news, they would likely be in this issue.

Hey guys, do we have any updates on it?

@vyahello

@vyahello see the comment right above yours. I'm not sure what you're trying to achieve by asking the same thing again a month later...

Prohibit pytest.mark.usefixtures in pytest.param (#12828)

chore(deps): update dependency pytest to v9 (#305)

Closing as resolved: this now produces an explicit ValueError ("pytest.param cannot add pytest.mark.usefixtures") at collection time instead of silently doing nothing, per #12828 (see changelog entry for #4112).

Navigation Menu

Repository navigation

Cannot use pytest.mark.usefixtures() in pytest.param #4112

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Cannot use pytest.mark.usefixtures() in pytest.param #4112

Description

Activity

RonnyPfannschmidt commented on Oct 11, 2018

voronovpetr commented on Nov 15, 2018

RonnyPfannschmidt commented on Nov 15, 2018

nchammas commented on Jul 8, 2020

DenisKuplyakov commented on Mar 28, 2022

The-Compiler commented on Mar 28, 2022

vyahello commented on May 1, 2022

The-Compiler commented on May 1, 2022

Zac-HD commented on Jul 22, 2026

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions