sanic/tests/test_signal_handlers.py

from sanic.response import HTTPResponse
from sanic.testing import HOST, PORT
from unittest.mock import MagicMock
import asyncio
from queue import Queue


async def stop(app, loop):
    await asyncio.sleep(0.1)
    app.stop()


calledq = Queue()


def set_loop(app, loop):
    loop.add_signal_handler = MagicMock()


def after(app, loop):
    calledq.put(loop.add_signal_handler.called)


def test_register_system_signals(app):
    """Test if sanic register system signals"""

    @app.route("/hello")
    async def hello_route(request):
        return HTTPResponse()

    app.listener("after_server_start")(stop)
    app.listener("before_server_start")(set_loop)
    app.listener("after_server_stop")(after)

    app.run(HOST, PORT)
    assert calledq.get() is True


def test_dont_register_system_signals(app):
    """Test if sanic don't register system signals"""

    @app.route("/hello")
    async def hello_route(request):
        return HTTPResponse()

    app.listener("after_server_start")(stop)
    app.listener("before_server_start")(set_loop)
    app.listener("after_server_stop")(after)

    app.run(HOST, PORT, register_sys_signals=False)
    assert calledq.get() is False