Test client usage question: how to trigger lifespan startup and shutdown ?

I have an issue switching from the TestClient from async_asgi_testclient to the httpx.AsyncClient : the startup and shutdown events of my app aren’t triggered by the latter.

It’s probably a bad usage on my end, but if anyone could pinpoint what I’m doing wrong it would be of tremendous help,

I wrote a small set of 2 tests below to better describe the situation, the one with httpx.AsyncClient fails while the other passes fine:

import logging

import pytest
from async_asgi_testclient import TestClient
from httpx import AsyncClient
from starlette.applications import Starlette
from starlette.requests import Request
from starlette.responses import JSONResponse

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

app = Starlette()


@app.on_event("startup")
async def startup():
    logger.debug("starting the app")


@app.on_event("shutdown")
async def shutdown():
    logger.debug("shutdown the app")


@app.route("/")
def homepage(request: Request):
    logger.debug("HOME")
    return JSONResponse({"hello": "world"})


@pytest.fixture
async def asyncasgitestclient():
    yield TestClient(app)


@pytest.fixture
async def httpxclient():
    yield AsyncClient(app=app, base_url="https://domain.tld")


@pytest.mark.asyncio
async def test_homepage_with_httpxclient(httpxclient, caplog):
    async with httpxclient:
        url = app.url_path_for("homepage")
        resp = await httpxclient.get(url)
        assert resp.status_code == 200
        assert resp.json() == {"hello": "world"}
    logger.debug(caplog.messages)
    assert all(
        x in caplog.messages for x in ["starting the app", "HOME", "shutdown the app"]
    )


@pytest.mark.asyncio
async def test_homepage_with_async_asgi_testclient(asyncasgitestclient, caplog):
    async with asyncasgitestclient:
        url = app.url_path_for("homepage")
        resp = await asyncasgitestclient.get(url)
        assert resp.status_code == 200
        assert resp.json() == {"hello": "world"}
    logger.debug(caplog.messages)
    assert all(
        x in caplog.messages for x in ["starting the app", "HOME", "shutdown the app"]
    )

[florimondmanca]

Okay so, I created https://github.com/florimondmanca/asgi-lifespan to experiment on this. It’s mostly empty for now but I’ll add LifespanContext based on the implementation in #352, and I plan to have LifespanMiddleware be mostly ripped out from Starlette.

Any thoughts on the proposed API there?

[sethmlarson]

Dropping in just to say that it’s a bummer that a full ASGI use-case can’t be solved with just HTTPX. IMO this is one of our defining features as an HTTP client in the ecosystem.