Let your Python tests travel through time
Project description
FreezeGun: Let your Python tests travel through time
====================================================
.. image:: https://secure.travis-ci.org/spulec/freezegun.png?branch=master
:target: https://travis-ci.org/spulec/freezegun
.. image:: https://coveralls.io/repos/spulec/freezegun/badge.png?branch=master
:target: https://coveralls.io/r/spulec/freezegun
FreezeGun is a library that allows your python tests to travel through time by mocking the datetime module.
Usage
-----
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.
Decorator
~~~~~~~~~
.. code-block:: python
from freezegun import freeze_time
import datetime
import unittest
@freeze_time("2012-01-14")
def test():
assert datetime.datetime.now() == datetime.datetime(2012, 1, 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(1955, 11, 12)
# 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, 1, 14)
Context Manager
~~~~~~~~~~~~~~~
.. code-block:: python
from freezegun import freeze_time
def test():
assert datetime.datetime.now() != datetime.datetime(2012, 1, 14)
with freeze_time("2012-01-14"):
assert datetime.datetime.now() == datetime.datetime(2012, 1, 14)
assert datetime.datetime.now() != datetime.datetime(2012, 1, 14)
Raw use
~~~~~~~
.. code-block:: python
from freezegun import freeze_time
freezer = freeze_time("2012-01-14 12:00:01")
freezer.start()
assert datetime.datetime.now() == datetime.datetime(2012, 1, 14, 12, 0, 1)
freezer.stop()
Timezones
~~~~~~~~~
.. code-block:: python
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, 1, 14, 3, 21, 34)
assert datetime.datetime.now() == datetime.datetime(2012, 1, 13, 23, 21, 34)
# datetime.date.today() uses local time
assert datetime.date.today() == datetime.date(2012, 1, 13)
Nice inputs
~~~~~~~~~~~
FreezeGun uses dateutil behind the scenes so you can have nice-looking datetimes
.. code-block:: python
@freeze_time("Jan 14th, 2012")
def test_nice_datetime():
assert datetime.datetime.now() == datetime.datetime(2012, 1, 14)
`tick` argument
~~~~~~~~~~~
FreezeGun has an additional `tick` argument which will restart time at the given
value, but then time will keep ticking. This is alternative to the default
parameters which will keep time stopped.
.. code-block:: python
@freeze_time("Jan 14th, 2020", tick=True)
def test_nice_datetime():
assert datetime.datetime.now() > datetime.datetime(2020, 1, 14)
Manual ticks
~~~~~~~~~~~~
Freezegun allows for the time to be manually forwarded as well
.. code-block:: python
def test_manual_increment():
initial_datetime = datetime.datetime(year=1, month=7, day=12,
hour=15, minute=6, second=3)
with freeze_time(initial_datetime) as frozen_datetime:
assert frozen_datetime() == initial_datetime
frozen_datetime.tick()
initial_datetime += datetime.timedelta(seconds=1)
assert frozen_datetime() == initial_datetime
frozen_datetime.tick(delta=datetime.timedelta(seconds=10))
initial_datetime += datetime.timedelta(seconds=10)
assert frozen_datetime() == initial_datetime
Moving time to specify datetime
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Freezegun allows moving time to specific dates
.. code-block:: python
def test_move_to():
initial_datetime = datetime.datetime(year=1, month=7, day=12,
hour=15, minute=6, second=3)
other_datetime = datetime.datetime(year=2, month=8, day=13,
hour=14, minute=5, second=0)
with freeze_time(initial_datetime) as frozen_datetime:
assert frozen_datetime() == initial_datetime
frozen_datetime.move_to(other_datetime)
assert frozen_datetime() == other_datetime
frozen_datetime.move_to(initial_datetime)
assert frozen_datetime() == initial_datetime
Parameter for ``move_to`` can be any valid ``freeze_time`` date (string, date, datetime).
Default Arguments
~~~~~~~~~~~~~~~~~
Note that Freezegun will not modify default arguments. The following code will
print the current date. See `here <http://docs.python-guide.org/en/latest/writing/gotchas/#mutable-default-arguments>`_ for why.
.. code-block:: python
from freezegun import freeze_time
import datetime as dt
def test(default=dt.date.today()):
print(default)
with freeze_time('2000-1-1'):
test()
Installation
------------
To install FreezeGun, simply:
.. code-block:: bash
$ pip install freezegun
On Debian (Testing and Unstable) systems:
.. code-block:: bash
$ sudo apt-get install python-freezegun
====================================================
.. image:: https://secure.travis-ci.org/spulec/freezegun.png?branch=master
:target: https://travis-ci.org/spulec/freezegun
.. image:: https://coveralls.io/repos/spulec/freezegun/badge.png?branch=master
:target: https://coveralls.io/r/spulec/freezegun
FreezeGun is a library that allows your python tests to travel through time by mocking the datetime module.
Usage
-----
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.
Decorator
~~~~~~~~~
.. code-block:: python
from freezegun import freeze_time
import datetime
import unittest
@freeze_time("2012-01-14")
def test():
assert datetime.datetime.now() == datetime.datetime(2012, 1, 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(1955, 11, 12)
# 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, 1, 14)
Context Manager
~~~~~~~~~~~~~~~
.. code-block:: python
from freezegun import freeze_time
def test():
assert datetime.datetime.now() != datetime.datetime(2012, 1, 14)
with freeze_time("2012-01-14"):
assert datetime.datetime.now() == datetime.datetime(2012, 1, 14)
assert datetime.datetime.now() != datetime.datetime(2012, 1, 14)
Raw use
~~~~~~~
.. code-block:: python
from freezegun import freeze_time
freezer = freeze_time("2012-01-14 12:00:01")
freezer.start()
assert datetime.datetime.now() == datetime.datetime(2012, 1, 14, 12, 0, 1)
freezer.stop()
Timezones
~~~~~~~~~
.. code-block:: python
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, 1, 14, 3, 21, 34)
assert datetime.datetime.now() == datetime.datetime(2012, 1, 13, 23, 21, 34)
# datetime.date.today() uses local time
assert datetime.date.today() == datetime.date(2012, 1, 13)
Nice inputs
~~~~~~~~~~~
FreezeGun uses dateutil behind the scenes so you can have nice-looking datetimes
.. code-block:: python
@freeze_time("Jan 14th, 2012")
def test_nice_datetime():
assert datetime.datetime.now() == datetime.datetime(2012, 1, 14)
`tick` argument
~~~~~~~~~~~
FreezeGun has an additional `tick` argument which will restart time at the given
value, but then time will keep ticking. This is alternative to the default
parameters which will keep time stopped.
.. code-block:: python
@freeze_time("Jan 14th, 2020", tick=True)
def test_nice_datetime():
assert datetime.datetime.now() > datetime.datetime(2020, 1, 14)
Manual ticks
~~~~~~~~~~~~
Freezegun allows for the time to be manually forwarded as well
.. code-block:: python
def test_manual_increment():
initial_datetime = datetime.datetime(year=1, month=7, day=12,
hour=15, minute=6, second=3)
with freeze_time(initial_datetime) as frozen_datetime:
assert frozen_datetime() == initial_datetime
frozen_datetime.tick()
initial_datetime += datetime.timedelta(seconds=1)
assert frozen_datetime() == initial_datetime
frozen_datetime.tick(delta=datetime.timedelta(seconds=10))
initial_datetime += datetime.timedelta(seconds=10)
assert frozen_datetime() == initial_datetime
Moving time to specify datetime
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Freezegun allows moving time to specific dates
.. code-block:: python
def test_move_to():
initial_datetime = datetime.datetime(year=1, month=7, day=12,
hour=15, minute=6, second=3)
other_datetime = datetime.datetime(year=2, month=8, day=13,
hour=14, minute=5, second=0)
with freeze_time(initial_datetime) as frozen_datetime:
assert frozen_datetime() == initial_datetime
frozen_datetime.move_to(other_datetime)
assert frozen_datetime() == other_datetime
frozen_datetime.move_to(initial_datetime)
assert frozen_datetime() == initial_datetime
Parameter for ``move_to`` can be any valid ``freeze_time`` date (string, date, datetime).
Default Arguments
~~~~~~~~~~~~~~~~~
Note that Freezegun will not modify default arguments. The following code will
print the current date. See `here <http://docs.python-guide.org/en/latest/writing/gotchas/#mutable-default-arguments>`_ for why.
.. code-block:: python
from freezegun import freeze_time
import datetime as dt
def test(default=dt.date.today()):
print(default)
with freeze_time('2000-1-1'):
test()
Installation
------------
To install FreezeGun, simply:
.. code-block:: bash
$ pip install freezegun
On Debian (Testing and Unstable) systems:
.. code-block:: bash
$ sudo apt-get install python-freezegun
Project details
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
freezegun-vinta-0.3.7.1.tar.gz
(16.3 kB
view hashes)