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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
.. image:: https://coveralls.io/repos/spulec/freezegun/badge.png?branch=master

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(), and datetime.date.today() will return the time that has been frozen.

Decorator
~~~~~~~~~

.. code-block:: python

from freezegun import freeze_time

@freeze_time("2012-01-14")
def test():
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)

# Or class based

@freeze_time("2012-01-14")
class Tester(object):
def test_the_class(self):
assert datetime.datetime.now() == datetime.datetime(2012, 01, 14)

Context Manager
~~~~~~~~~~~~~~~

.. code-block:: python

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)

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, 01, 14, 12, 00, 01)
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, 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.datetime(2012, 01, 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, 01, 14)

Installation
------------

To install FreezeGun, simply:

.. code-block:: bash

$ pip install freezegun

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