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[EDIT] FILE: test_date.py

from datetime import date as d, timedelta
from time import strptime
from typing import cast, Type

from testfixtures import ShouldRaise, mock_date, replace, compare
from testfixtures.datetime import MockDate
from testfixtures.tests import sample1, sample2
from unittest import TestCase

class TestDate(TestCase):

# NB: Only the today method is currently stubbed out,
    #     if you need other methods, tests and patches
    #     greatfully received!

@replace('datetime.date', mock_date())
    def test_today(self):
        from datetime import date
        compare(date.today(), d(2001, 1, 1))
        compare(date.today(), d(2001, 1, 2))
        compare(date.today(), d(2001, 1, 4))

@replace('datetime.date', mock_date(2001, 2, 3))
    def test_today_supplied(self):
        from datetime import date
        compare(date.today(), d(2001, 2, 3))

@replace('datetime.date', mock_date(year=2001, month=2, day=3))
    def test_today_all_kw(self):
        from datetime import date
        compare(date.today(), d(2001, 2, 3))

@replace('datetime.date', mock_date(None))
    def test_today_sequence(self, t: Type[MockDate]):
        t.add(2002, 1, 1)
        t.add(2002, 1, 2)
        t.add(2002, 1, 3)
        from datetime import date
        compare(date.today(), d(2002, 1, 1))
        compare(date.today(), d(2002, 1, 2))
        compare(date.today(), d(2002, 1, 3))

@replace('datetime.date', mock_date(None))
    def test_today_requested_longer_than_supplied(self, t: Type[MockDate]):
        t.add(2002, 1, 1)
        t.add(2002, 1, 2)
        from datetime import date
        compare(date.today(), d(2002, 1, 1))
        compare(date.today(), d(2002, 1, 2))
        compare(date.today(), d(2002, 1, 3))
        compare(date.today(), d(2002, 1, 5))

@replace('datetime.date', mock_date(None))
    def test_add_date_supplied(self):
        from datetime import date
        date = cast(Type[MockDate], date)
        date.add(d(2001, 1, 2))
        date.add(date(2001, 1, 3))
        compare(date.today(), d(2001, 1, 2))
        compare(date.today(), d(2001, 1, 3))

def test_instantiate_with_date(self):
        from datetime import date
        t = mock_date(date(2002, 1, 1))
        compare(t.today(), d(2002, 1, 1))

@replace('datetime.date', mock_date(strict=True))
    def test_call(self, t: Type[MockDate]):
        compare(t(2002, 1, 2), d(2002, 1, 2))
        from datetime import date
        dt = date(2003, 2, 1)
        self.assertFalse(dt.__class__ is d)
        compare(dt, d(2003, 2, 1))

def test_gotcha_import(self):
        # standard `replace` caveat, make sure you
        # patch all revelent places where date
        # has been imported:

@replace('datetime.date', mock_date())
        def test_something():
            from datetime import date
            compare(date.today(), d(2001, 1, 1))
            compare(sample1.str_today_1(), '2001-01-02')

with ShouldRaise(AssertionError) as s:
            test_something()
        # This convoluted check is because we can't stub
        # out the date, since we're testing stubbing out
        # the date ;-)
        j, dt1, j, dt2, j = s.raised.args[0].split("'")
        # check we can parse the date
        dt1 = strptime(dt1, '%Y-%m-%d')
        # check the dt2 bit was as it should be
        compare(dt2, '2001-01-02')

# What you need to do is replace the imported type:
        @replace('testfixtures.tests.sample1.date', mock_date())
        def test_something():
            compare(sample1.str_today_1(), '2001-01-01')

test_something()

def test_gotcha_import_and_obtain(self):
        # Another gotcha is where people have locally obtained
        # a class attributes, where the normal patching doesn't
        # work:

@replace('testfixtures.tests.sample1.date', mock_date())
        def test_something():
            compare(sample1.str_today_2(), '2001-01-01')

# What you need to do is replace the imported name:
        @replace('testfixtures.tests.sample1.today', mock_date().today)
        def test_something():
            compare(sample1.str_today_2(), '2001-01-01')

test_something()

# if you have an embedded `today` as above, *and* you need to supply
    # a list of required dates, then it's often simplest just to
    # do a manual try-finally with a replacer:
    def test_import_and_obtain_with_lists(self):

t = mock_date(None)
        t.add(2002, 1, 1)
        t.add(2002, 1, 2)

from testfixtures import Replacer
        r = Replacer()
        r.replace('testfixtures.tests.sample1.today', t.today)
        try:
            compare(sample1.str_today_2(), '2002-01-01')
            compare(sample1.str_today_2(), '2002-01-02')
        finally:
            r.restore()

@replace('datetime.date', mock_date())
    def test_repr(self):
        from datetime import date
        compare(repr(date), "<class 'testfixtures.datetime.MockDate'>")

@replace('datetime.date', mock_date(delta=2))
    def test_delta(self):
        from datetime import date
        compare(date.today(), d(2001, 1, 1))
        compare(date.today(), d(2001, 1, 3))
        compare(date.today(), d(2001, 1, 5))

@replace('datetime.date', mock_date(delta_type='weeks'))
    def test_delta_type(self):
        from datetime import date
        compare(date.today(), d(2001, 1, 1))
        compare(date.today(), d(2001, 1, 8))
        compare(date.today(), d(2001, 1, 22))

@replace('datetime.date', mock_date(None))
    def test_set(self):
        from datetime import date
        date = cast(Type[MockDate], date)
        date.set(2001, 1, 2)
        compare(date.today(), d(2001, 1, 2))
        date.set(2002, 1, 1)
        compare(date.today(), d(2002, 1, 1))
        compare(date.today(), d(2002, 1, 3))

@replace('datetime.date', mock_date(None))
    def test_set_date_supplied(self):
        from datetime import date
        date = cast(Type[MockDate], date)
        date.set(d(2001, 1, 2))
        compare(date.today(), d(2001, 1, 2))
        date.set(date(2001, 1, 3))
        compare(date.today(), d(2001, 1, 3))

@replace('datetime.date', mock_date(None))
    def test_set_kw(self):
        from datetime import date
        date = cast(Type[MockDate], date)
        date.set(year=2001, month=1, day=2)
        compare(date.today(), d(2001, 1, 2))

@replace('datetime.date', mock_date(None))
    def test_add_kw(self, t: Type[MockDate]):
        t.add(year=2002, month=1, day=1)
        from datetime import date
        compare(date.today(), d(2002, 1, 1))

@replace('datetime.date', mock_date(strict=True))
    def test_isinstance_strict_true(self):
        from datetime import date
        date = cast(Type[MockDate], date)
        to_check = []
        to_check.append(date(1999, 1, 1))
        to_check.append(date.today())
        date.set(2001, 1, 2)
        to_check.append(date.today())
        date.add(2001, 1, 3)
        to_check.append(date.today())
        to_check.append(date.today())
        date.set(date(2001, 1, 4))
        to_check.append(date.today())
        date.add(date(2001, 1, 5))
        to_check.append(date.today())
        to_check.append(date.today())
        date.set(d(2001, 1, 4))
        to_check.append(date.today())
        date.add(d(2001, 1, 5))
        to_check.append(date.today())
        to_check.append(date.today())

for inst in to_check:
            self.assertTrue(isinstance(inst, date), inst)
            self.assertTrue(inst.__class__ is date, inst)
            self.assertTrue(isinstance(inst, d), inst)
            self.assertFalse(inst.__class__ is d, inst)

def test_strict_addition(self):
        mock_d = mock_date(strict=True)
        dt = mock_d(2001, 1, 1) + timedelta(days=1)
        assert type(dt) is mock_d

def test_non_strict_addition(self):
        from datetime import date
        mock_d = mock_date(strict=False)
        dt = mock_d(2001, 1, 1) + timedelta(days=1)
        assert type(dt) is date

def test_strict_add(self):
        mock_d = mock_date(None, strict=True)
        mock_d.add(2001, 1, 1)
        assert type(mock_d.today()) is mock_d

def test_non_strict_add(self):
        from datetime import date
        mock_d = mock_date(None, strict=False)
        mock_d.add(2001, 1, 1)
        assert type(mock_d.today()) is date

@replace('datetime.date', mock_date())
    def test_isinstance_default(self):
        from datetime import date
        date = cast(Type[MockDate], date)
        to_check = []
        to_check.append(date(1999, 1, 1))
        to_check.append(date.today())
        date.set(2001, 1, 2)
        to_check.append(date.today())
        date.add(2001, 1, 3)
        to_check.append(date.today())
        to_check.append(date.today())
        date.set(date(2001, 1, 4))
        to_check.append(date.today())
        date.add(date(2001, 1, 5))
        to_check.append(date.today())
        to_check.append(date.today())
        date.set(d(2001, 1, 4))
        to_check.append(date.today())
        date.add(d(2001, 1, 5))
        to_check.append(date.today())
        to_check.append(date.today())

for inst in to_check:
            self.assertFalse(isinstance(inst, date), inst)
            self.assertFalse(inst.__class__ is date, inst)
            self.assertTrue(isinstance(inst, d), inst)
            self.assertTrue(inst.__class__ is d, inst)

def test_tick_when_static(self):
        date = mock_date(delta=0)
        compare(date.today(), expected=d(2001, 1, 1))
        date.tick(days=1)
        compare(date.today(), expected=d(2001, 1, 2))

def test_tick_when_dynamic(self):
        # hopefully not that common?
        date = mock_date()
        compare(date.today(), expected=date(2001, 1, 1))
        date.tick(days=1)
        compare(date.today(), expected=date(2001, 1, 3))

def test_tick_with_timedelta_instance(self):
        date = mock_date(delta=0)
        compare(date.today(), expected=d(2001, 1, 1))
        date.tick(timedelta(days=1))
        compare(date.today(), expected=d(2001, 1, 2))

def test_old_import(self):
        from testfixtures import test_date
        assert test_date is mock_date

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