I have this code which used to work:

import unittestfrom flask import url_forfrom dm.web import create_app, dbclass TestApi(unittest.TestCase):def setUp(self):"""Create and configure a new app instance for each test."""self.app = create_app('test')self.app_context = self.app.app_context()self.app_context.push()db.create_all()self.client = self.app.test_client(use_cookies=True)def tearDown(self) -> None:db.session.remove()db.drop_all()self.app_context.pop()def test_url(self):self.assertEqual('/', url_for('root.home'))if __name__ == '__main__':unittest.main()

But since today I am getting this error:

ERROR: test_url (__main__.TestApi)
----------------------------------------------------------------------
Traceback (most recent call last):File "/home/joan/.PyCharmCE2019.3/config/scratches/scratch.py", line 17, in test_urlself.assertEqual('/', url_for('root.home'))File "/home/joan/venvs/dimensigon3.7/lib/python3.7/site-packages/flask/helpers.py", line 333, in url_for"Application was not able to create a URL adapter for request"
RuntimeError: Application was not able to create a URL adapter for request independent URL generation. You might be able to fix this by setting the SERVER_NAME config variable.

From what I see in the url_for, I am getting None on the appctx.url_adapter which I don't know when it is set.

Thanks!

As per this blog post, you could try this pattern, which gives you both an app context and a temporary request context:

    def test_url(self):with app.app_context(), app.test_request_context():self.assertEqual('/', url_for('root.home'))