Doc: https://flask.palletsprojects.com/en/2.3.x/testing/ Doc de PyTest : https://docs.pytest.org/en/8.0.x/

Tutorials:

• https://testdriven.io/blog/flask-pytest/
• https://circleci.com/blog/testing-flask-framework-with-pytest/

pip install pytest

./my_project
    /app
        /static
            ...
        /templates
            ...
        /tests
            __init__.py              (fichier vide)
            test_articles.py
            test_fonctions.py
            test_divers.py
            ...
        __init__.py                (racine de l'application)

from ..services.tools import sub_month
import pytest, datetime
 
 
def test_sub_month_1():
    d1 = datetime.datetime(2023, 3, 15)
    d2 = sub_month(d1)
    assert d2.year  == 2023
    assert d2.month == 2
    assert d2.day   == 15

pytest