README lock example is not clear

[nilsguillermin]

I'm sorry, I don't really understand how to read the "Mocks & Shared Resources" example in the readme. Is it missing the code for access_shared_resource()? Can we clarify how lock is used?

import asyncio
import pytest
from pytest_asyncio_cooperative import Lock

my_lock = Lock()

@pytest.fixture(scope="function")
async def lock():
    async with my_lock():
        yield

@pytest.mark.asyncio_cooperative
async def test_a(lock, mocker):
    await asyncio.sleep(2)
    mocker.patch("service.http.on_handler")
    access_shared_resource()
    assert my_fixture == "XXX"

@pytest.mark.asyncio_cooperative
async def test_b(lock, mocker):
    await asyncio.sleep(2)
    mocker.patch("service.http.on_handler")
    access_shared_resource()
    assert my_fixture == "XXX"