FreezeGun is a library that allows your python tests to travel through time by mocking the datetime module.
Once the decorator or context manager have been invoked, all calls to datetime.datetime.now(), datetime.datetime.utcnow(), datetime.date.today(), time.time(), time.localtime(), time.gmtime(), and time.strftime() will return the time that has been frozen.
from freezegun import freeze_time
@freeze_time("2012-01-14")
def test():
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)
# Or a unittest TestCase - freezes for every test, from the start of setUpClass to the end of tearDownClass
@freeze_time("1955-11-12")
class MyTests(unittest.TestCase):
def test_the_class(self):
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)
# Or any other class - freezes around each callable (may not work in every case)
@freeze_time("2012-01-14")
class Tester(object):
def test_the_class(self):
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)from freezegun import freeze_time
def test():
assert datetime.datetime.now() != datetime.datetime(2012, 01, 14)
with freeze_time("2012-01-14"):
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)
assert datetime.datetime.now() != datetime.datetime(2012, 01, 14)from freezegun import freeze_time
freezer = freeze_time("2012-01-14 12:00:01")
freezer.start()
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14, 12, 00, 01)
freezer.stop()from freezegun import freeze_time
@freeze_time("2012-01-14 03:21:34", tz_offset=-4)
def test():
assert datetime.datetime.utcnow() == datetime.datetime(2012, 01, 14, 03, 21, 34)
assert datetime.datetime.now() == datetime.datetime(2012, 01, 13, 23, 21, 34)
# datetime.date.today() uses local time
assert datetime.date.today() == datetime.date(2012, 01, 13)FreezeGun uses dateutil behind the scenes so you can have nice-looking datetimes
@freeze_time("Jan 14th, 2012")
def test_nice_datetime():
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)To install FreezeGun, simply:
$ pip install freezegunOn Debian (Testing and Unstable) systems:
$ sudo apt-get install python-freezegun
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