pytest-freezeblaster

Wrap tests with fixtures in freeze_time

Features

• Freeze time in both the test and fixtures
• Access the freezer when you need it

Installation

You can install "pytest-freezeblaster" via pip from PyPI:

$ pip install pytest-freezeblaster

Usage

Freeze time by using the freezer fixture:

def test_frozen_date(freezer):
    now = datetime.now()
    time.sleep(1)
    later = datetime.now()
    assert now == later

This can then be used to move time:

def test_moving_date(freezer):
    now = datetime.now()
    freezer.move_to('2017-05-20')
    later = datetime.now()
    assert now != later

You can also pass arguments to freezegun by using the freeze_time mark:

@pytest.mark.freeze_time('2017-05-21')
def test_current_date():
    assert date.today() == date(2017, 5, 21)

The freezer fixture and freeze_time mark can be used together, and they work with other fixtures:

@pytest.fixture
def current_date():
    return date.today()

@pytest.mark.freeze_time
def test_changing_date(current_date, freezer):
    freezer.move_to('2017-05-20')
    assert current_date == date(2017, 5, 20)
    freezer.move_to('2017-05-21')
    assert current_date == date(2017, 5, 21)

They can also be used in class-based tests:

class TestDate:
    @pytest.mark.freeze_time
    def test_changing_date(self, current_date, freezer):
        freezer.move_to('2017-05-20')
        assert current_date == date(2017, 5, 20)
        freezer.move_to('2017-05-21')
        assert current_date == date(2017, 5, 21)

Credits

All credits go to ktosiek.