Pytest: mocking datetime.date.today

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examples/pytest/mock-get-today/app.py

import datetime

def get_today():
    return datetime.date.today()

examples/pytest/mock-get-today/use_app.py

import app

today = app.get_today()
print(type(today))
print(today)

examples/pytest/mock-get-today/test_app.py

import app
import datetime

def test_new_year(monkeypatch):
    mydt = datetime.date
    class MyDate():
        def today():
            return mydt(2000, 1, 1)

    monkeypatch.setattr(app.datetime, 'date', MyDate)
    today = app.get_today()
    #print(today)
    assert str(today) == '2000-01-01'

def test_leap_year(monkeypatch):
    mydt = datetime.date
    class MyDate():
        def today():
            return mydt(2004, 2, 29)

    monkeypatch.setattr(app.datetime, 'date', MyDate)
    today = app.get_today()
    #print(today)
    assert str(today) == '2004-02-29'