Pytest Annotated

A Pytest plugin to allow the use of Annotated to resolve fixtures, allowing test arguments to have different names to the fixture itself.

Usage:

Simple:

from typing import Annotated
from pytest_annotated import Fixture

class SomeThing:
    pass

@pytest.fixture
async def somefixture(someotherfixture) -> SomeThing:
    return SomeThing()

async def test_thing(st: Annotated[SomeThing, Fixture(somefixture)]):
    assert isinstance(st, SomeThing)

Aliased:

from typing import Annotated
from pytest_annotated import Fixture

class SomeThing:
    pass

@pytest.fixture
async def somefixture(someotherfixture) -> SomeThing:
    return SomeThing()

SomethingFixture = Annotated[SomeThing, Fixture(somefixture)]

async def test_thing(st: SomethingFixture):
    assert isinstance(st, SomeThing)

Registered Type:

Uses @pytest_annotated.fixture instead of @pytest.fixture to register the annotated return type of a fixture to always be resolved using that fixture.

from typing import Annotated
import pytest_annotated
from pytest_annotated import Fixture

class SomeThing:
    pass

@pytest_annotated.fixture
async def somefixture(someotherfixture) -> SomeThing:
    return SomeThing()

async def test_thing(st: SomeThing):
    assert isinstance(st, SomeThing)

TODO:

• Support Annotated function arguments in fixtures as well.
• Figure out if there's a way to do this without using so many _private parts of pytest!