async def METHOD_NAME(
    aiohttp_server: _TestServerFactory, make_client: _MakeClient
) -> AsyncIterator[Client]:
    async def handler(request: web.Request) -> web.Response:
        data = await request.json()
        assert data["name"].startswith("mycompany/")
        raise web.HTTPCreated()
    app = web.Application()
    app.router.add_post("/users", handler)
    srv = await aiohttp_server(app)
    client = make_client(srv.make_url("/"))
    yield client
    await client.close()