parametrized fixture with session scope initialized twise

Originally reported by: BitBucket: aokhotin, GitHub: aokhotin

I attached two files were bug reproduced.
steps:

#!bash

$ py.test --version
This is pytest version 2.6.4, imported from /home/username/venv/local/lib/python2.7/site-packages/pytest.pyc

so there no any plugins.

#!bash

 py.test -sv
============================= test session starts ==============================
platform linux2 -- Python 2.7.6 -- py-1.4.26 -- pytest-2.6.4 -- /home/username/venv/bin/python
collected 21 items 

test_solar.py::test_one PASSED
test_solar.py::test_three[pluto-1] sun '1'
"sun '1'" - "pluto"
PASSED
test_solar.py::test_four[pluto-1] PASSED
test_solar.py::test_three[pluto-2] sun '2'
"sun '2'" - "pluto"
PASSED
test_solar.py::test_four[pluto-2] PASSED
test_solar.py::test_three[neptun-2] "sun '2'" - "neptun"
PASSED
test_solar.py::test_four[neptun-2] PASSED
test_solar.py::test_three[neptun-1] sun '1'
"sun '1'" - "neptun"
PASSED
test_solar.py::test_four[neptun-1] PASSED
test_solar.py::test_three[neptun-3] sun '3'
"sun '3'" - "neptun"
PASSED
test_solar.py::test_four[neptun-3] PASSED
test_solar.py::test_three[pluto-3] "sun '3'" - "pluto"
PASSED
test_solar.py::test_four[pluto-3] PASSED
test_solar.py::test_three[neptun-4] sun '4'
"sun '4'" - "neptun"
PASSED
test_solar.py::test_four[neptun-4] PASSED
test_solar.py::test_three[pluto-4] "sun '4'" - "pluto"
PASSED
test_solar.py::test_four[pluto-4] PASSED
test_solar.py::test_three[neptun-5] sun '5'
"sun '5'" - "neptun"
PASSED
test_solar.py::test_four[neptun-5] PASSED
test_solar.py::test_three[pluto-5] "sun '5'" - "pluto"
PASSED
test_solar.py::test_four[pluto-5] PASSED

The fact that "sun '1'" have been initialized twise is unexpected.

Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/684

Original comment by Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt):

i believe this is an artifact of fixture dependency ordering combined with test ordering
while it is not "wrong", its certainly unfortunate, as it is bad for test time,

also we could consider caching parametrized setupstate at session scope

test_solar.py

__author__ = 'aokhotin'


def test_one():
    pass


def test_three(sunoption):
    pass


def test_four(sunoption):
    pass

conftest.py

import pytest


@pytest.fixture(scope="session", params=["1", "2", "3", "4", "5"])
def sun(request):
    value = "sun '{}'".format(request.param)
    print value
    return value


@pytest.fixture(scope="session", params=["pluto", "neptun"])
def sunoption(sun, request):
    value = '"{}" - "{}"'.format(sun, request.param)
    print value
    return value

Fixed in #1766

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parametrized fixture with session scope initialized twise #684

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parametrized fixture with session scope initialized twise #684

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pytestbot commented on Feb 22, 2015

pfctdayelise commented on Jul 25, 2015

nicoddemus commented on Jul 25, 2016

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