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Frozen date: freeze datetime.now at a known value for testing

Project description

Frozendate suspends time while your tests run.

Frozendate mocks datetime.datetime and datetime.date to provide known times when testing.

Usage

import frozendate

with frozendate.freeze(1999, 1, 1):
    party_like_its_1999()

# freeze relative freezes time relative to the current date...
with freeze_relative(days=-1):
    assert all_my_troubles_seemed_so_far_away()

with freeze(1999, 12, 31):
    # ...or relative to the previous freeze
    with freeze_relative(days=1):
        print "happy new year!"

Normally time doesn’t actually stop when you use freeze – it just starts again from the fixed point you specify, eg:

>>> import frozendate
>>> import datetime
>>> with frozendate.freeze(2000, 1, 1):
...     print datetime.now().replace(microsecond=0)
...     time.sleep(1)
...     print datetime.now().replace(microsecond=0)
...
2000-01-01 00:00:00
2000-01-01 00:00:01

But you can always get the same value back if you pass hard=True:

>>> with frozendate.freeze(2000, 1, 1, hard=True):
...     print datetime.now().replace(microsecond=0)
...     time.sleep(1)
...     print datetime.now().replace(microsecond=0)
...
2000-01-01 00:00:00
2000-01-01 00:00:00

Instead of a context manager there are also regular patch and unpatch functions. These are useful in test case setup/teardown methods:

def setUp(self):
    frozendate.patch(2000, 1, 1)

def tearDown(self):
    frozendate.unpatch()

When you call freeze or patch, it freezes time for all modules found in sys.modules. Sometimes you want to restrict to a few named modules:

frozendate.freeze(modules=['mypackage.mymodule'])

Or patch everything, but exclude a few modules that need the real datetime still:

frozendate.freeze(dontpatch=['somemodule', 'someotherpackage'])

0.1.3 (released 2018-10-10)

  • Fix exception when used with dateutil
  • Add support for Python 3.7
  • Drop support for Python 2.6

Version 0.1.2

  • Add support for freezing datetime.utcnow()

Version 0.1.1

  • Fix for ImportErrors when used with six

Version 0.1

  • Initial release

Project details


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