Flask app.config in different thread

conftest.py

import pytest

from spike import create_app


@pytest.fixture
def app():
  return create_app()

Pipfile

[[source]]

url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"


[dev-packages]


[packages]

flask = "*"
pytest = "*"
pytest-flask = "*"



[requires]

python_version = "3.5"

spike.py

from threading import Thread

from flask import Flask


def trying_to_access_app_config():
    assert app.config['my_option']


def create_app():
    app = Flask(__name__)

    @app.route('/')
    def root():
        Thread(target=trying_to_access_app_config).start()

        return 'Kicked up!'

    return app


app = create_app()

test_spike.py

import pytest


def test_app_config_in_different_thread(client, config):
    config['my_option'] = 'spam'

    resp = client.get('/')

    assert resp.data == b'Kicked up!'


@pytest.mark.options(my_option=42)
def test_app_config_again(client):
    resp = client.get('/')

    assert resp.data == b'Kicked up!'