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Efficient datetime mocking in tests

Project description

FreezeFrog lets you efficiently mock datetimes in unit tests.

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Why FreezeFrog?

FreezeFrog is a Python library that lets you mock datetimes in unit tests. Its goal is to be simple and fast.

  • In comparison to certain other time freezing libraries, FreezeFrog doesn’t loop through all imported modules, making it fast even for larger projects.
  • FreezeFrog currently supports mocking the following basic methods:
    • (if tz_delta is specified)
    • datetime.datetime.utcnow
    • time.time


Use the FreezeTime context manager to freeze the time. Pass the desired datetime object to the constructor. The constructor also takes the tick keyword argument (False by default), which makes the clock start ticking.

from freezefrog import FreezeTime
import datetime

with FreezeTime(datetime.datetime(2014, 1, 1)):
    # The clock is frozen.
    # Always prints 2014-01-01 00:00:00
    print datetime.datetime.utcnow()

with FreezeTime(datetime.datetime(2014, 1, 1), tick=True):
    # The clock starts ticking immediately.
    # Example output: 2014-01-01 00:00:00.000005
    print datetime.datetime.utcnow()

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