How to use the uvicorn.supervisors.Multiprocess function in uvicorn

def test_multiprocess_run():
    """
    A basic sanity check.

    Simply run the supervisor against a no-op server, and signal for it to
    quit immediately.
    """
    config = Config(app=None, workers=2)
    supervisor = Multiprocess(config, target=run, sockets=[])
    supervisor.signal_handler(sig=signal.SIGINT, frame=None)
    supervisor.run()

server = Server(config=config)

    if (config.reload or config.workers > 1) and not isinstance(app, str):
        logger = logging.getLogger("uvicorn.error")
        logger.warn(
            "You must pass the application as an import string to enable 'reload' or 'workers'."
        )
        sys.exit(1)

    if config.should_reload:
        sock = config.bind_socket()
        supervisor = StatReload(config, target=server.run, sockets=[sock])
        supervisor.run()
    elif config.workers > 1:
        sock = config.bind_socket()
        supervisor = Multiprocess(config, target=server.run, sockets=[sock])
        supervisor.run()
    else:
        server.run()

# taken from uvicorn/main.py:run

        logger.debug("run@api_server.py - Building Uvicorn Config and Server")
        config = UvicornConfig(app, log_config=self.get_uvicorn_logging(), **kwargs)
        server = UvicornServer(config=config)
        if self.option("force_exit"):
            server.force_exit = True

        if isinstance(app, str) and (config.debug or config.reload):
            logger.warning(f"run@api_server.py - Running boucanpy api in dev mode...")
            sock = config.bind_socket()
            supervisor = StatReload(config)
            return supervisor.run(server.run, sockets=[sock])
        elif config.workers > 1:
            sock = config.bind_socket()
            supervisor = Multiprocess(config)
            logger.warning(
                f"run@api_server.py - Running boucanpy api in worker mode..."
            )
            return supervisor.run(server.run, sockets=[sock])
        else:
            sockets = None
            logger.warning(
                f"run@api_server.py - Running boucanpy api in standard mode..."
            )
            return await server.serve(sockets=sockets)