freezefrog - "замораживаем" (mock) время в тестах

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()