Overrides aren't resetted if container is created in pytest.fixture with scope session or module

I have a simple example application:

# my_app.py

import sys
from dependency_injector import containers, providers
from dependency_injector.wiring import inject, Provide


class MyResource:
    def __init__(self, value):
        self.value = value

    def provide(self):
        return self.value


class MyService:
    def __init__(self, resource: MyResource):
        self.resource = resource

    def do(self):
        return self.resource.provide()


class MyContainer(containers.DeclarativeContainer):

    resource = providers.Singleton(
        MyResource,
        value="my value",
    )

    service = providers.Singleton(
        MyService,
        resource=resource,
    )


@inject
def run(service: MyService = Provide[MyContainer.service]):
    return service.do()


def configure_container(container):
    container.wire(modules=[sys.modules[__name__]])


def main():
    container = MyContainer()
    configure_container(container)
    print(run())


if __name__ == '__main__':
    main()

And couple simple tests for it:

# test_app.py

from unittest.mock import MagicMock

import pytest

from my_app import MyContainer
from my_app import configure_container
from my_app import run


@pytest.fixture(scope="session", autouse=True)  # or scope="session"
def container_fixture():
    container = MyContainer()
    configure_container(container)
    return container


def test_1(container_fixture):
    overrided_test_resource = MagicMock()
    overrided_test_resource.provide.return_value = "overrided value"
    with container_fixture.resource.override(overrided_test_resource):
        assert run() == "overrided value"


def test_2():
    assert run() == "my value"

In tests, I want to create a container exactly once and reuse it in each test. In some tests, I want to override the behavior of the container member. But only for one test.

But instead, these overrides are not resetted, and they are applied for next tests.

And I am getting the error:

$ python -m pytest -v
============================= test session starts =============================
platform linux -- Python 3.8.5, pytest-6.2.2, py-1.10.0, pluggy-0.13.1 -- ...
cachedir: .pytest_cache
rootdir: ...
collected 2 items                                                             

tests/test_app.py::test_1 PASSED                                        [ 50%]
tests/test_app.py::test_2 FAILED                                        [100%]

================================== FAILURES ===================================
___________________________________ test_2 ____________________________________

    def test_2():
>       assert run() == "my value"
E       AssertionError: assert 'overrided value' == 'my value'
E         - my value
E         + overrided value

tests/test_app.py:25: AssertionError
=========================== short test summary info ===========================
FAILED tests/test_app.py::test_2 - AssertionError: assert 'overrided value' ...
========================= 1 failed, 1 passed in 0.05s =========================

If pytest.fixture has scope = function then no error will occur.

What can I do to temporarily override the container member using pytest.fixture session = scope?

Used environment:

Python 3.8.5
attrs==20.3.0
dependency-injector==4.29.1
iniconfig==1.1.1
packaging==20.9
pluggy==0.13.1
py==1.10.0
pyparsing==2.4.7
pytest==6.2.2
six==1.15.0
toml==0.10.2

[RockBomber]

Thanks for the help! I solved it with adding function scope fixture like:

@pytest.fixture(autouse=True)
def reset_singletones(container_fixture):
    with container_fixture.reset_singletons():
        yield

[robmoore]

I just spent a considerable amount of timing trying to run down this issue. I’d request that this behavior be added to the docs. I’m happy to create a PR if that’s helpful.