Pytest Current time test (fixed date and time)

Test with fixed time with Pytest

Note that I came across a scene where I wanted to test a method that returns the current time in Python The freezegun that can fix the date is convenient!

environment

• Python 3.7.5
• pytest-5.2.4

For pytest, there is pytest-freezegun as a plugin for pytest. @ Pytest.mark.freeze_time is added as a marker for pytest.

test_sample.py

from datetime import datetime
import pytest

@pytest.mark.freeze_time('2019-11-27 11:23:23')
def test_time():
    assert datetime.today() == datetime(2019, 11, 27, 11, 23, 23)

It's okay to import

get_today.py

def dateget():
    return datetime.datetime.today()

test_sample.py

from datetime import datetime
import pytest
import get_today

@pytest.mark.freeze_time('2019-11-27 11:23:23')
def test_time():
    assert get_today.dateget() == datetime(2019, 11, 27, 11, 23, 23)

$ python -m pytest test_sample.py

plugins: freezegun-0.3.0.post1
collected 1 item

test_sample.py .

==== 1 passed in 0.07 seconds ====

Supplement: I want to test 〇 minutes ago

If you mess with 〇 minutes (minutes = update_span) from the current time, 〇 hours or days before

test_sample.py

@pytest.mark.freeze_time('2019-11-27 11:23:23')
def test_time():
    correct_value = datetime(2019, 11, 27, 11, 20, 23)
    subtracted_time = datetime.now() - timedelta(minutes=3)
    assert subtracted_time == datetime(2019, 11, 27, 11, 20, 23)