Django Unit test : `freeze_time` not work well in some cases (Seems like a bug..?)

Question

This is my code for testing the role of TIME_ZONE and `USE_TZ:

from django.test.utils import override_settings

class TimeZoneTest(TestCase):

    @override_settings(TIME_ZONE='UTC', USE_TZ=True)
    @freeze_time("2018-01-04 13:30:55", tz_offset=9) # The reason that I add tz_offset=9 is to make local time samw with `Asia/Seoul`
    def test_freeze_time1(self):
        print("TIME_ZONE='UTC', USE_TZ=True")
        print(datetime.now())
        print(timezone.now())


    @override_settings(TIME_ZONE='UTC', USE_TZ=False)
    @freeze_time("2018-01-04 13:30:55", tz_offset=9)
    def test_freeze_time2(self):
        print("TIME_ZONE='UTC', USE_TZ=False")
        print(datetime.now())
        print(timezone.now())


    @override_settings(TIME_ZONE='Asia/Seoul', USE_TZ=True)
    @freeze_time("2018-01-04 13:30:55", tz_offset=9)
    def test_freeze_time3(self):
        print("TIME_ZONE='Asia/Seoul', USE_TZ=True")
        print(datetime.now())
        print(timezone.now())


    @override_settings(TIME_ZONE='Asia/Seoul', USE_TZ=False)
    @freeze_time("2018-01-04 13:30:55", tz_offset=9)
    def test_freeze_time4(self):
        print("TIME_ZONE='Asia/Seoul', USE_TZ=False")
        print(datetime.now())
        print(timezone.now())

Result

TIME_ZONE='UTC', USE_TZ=True
2018-01-04 22:30:55
2018-01-04 13:30:55+00:00

.TIME_ZONE='UTC', USE_TZ=False
2018-01-04 22:30:55
2018-01-04 22:30:55

.TIME_ZONE='Asia/Seoul', USE_TZ=True
2018-01-04 22:30:55
2018-01-04 13:30:55+00:00

.TIME_ZONE='Asia/Seoul', USE_TZ=False
2018-01-04 22:30:55
2018-01-04 22:30:55

The strange part is test_freeze_time1(), which tests under TIME_ZONE='UTC', USE_TZ=True, the reason that I think it strange is that datetime.now() doesn't print out UTC time, which is not True if I removed @freeze_time("2018-01-04 13:30:55", tz_offset=9) :

from django.test.utils import override_settings

class TimeZoneTest(TestCase):

    @override_settings(TIME_ZONE='UTC', USE_TZ=True)
    def test_freeze_time1(self):
        print("TIME_ZONE='UTC', USE_TZ=True")
        print(datetime.now())
        print(timezone.now())


    @override_settings(TIME_ZONE='UTC', USE_TZ=False)
    def test_freeze_time2(self):
        print("TIME_ZONE='UTC', USE_TZ=False")
        print(datetime.now())
        print(timezone.now())


    @override_settings(TIME_ZONE='Asia/Seoul', USE_TZ=True)
    def test_freeze_time3(self):
        print("TIME_ZONE='Asia/Seoul', USE_TZ=True")
        print(datetime.now())
        print(timezone.now())


    @override_settings(TIME_ZONE='Asia/Seoul', USE_TZ=False)
    def test_freeze_time4(self):
        print("TIME_ZONE='Asia/Seoul', USE_TZ=False")
        print(datetime.now())
        print(timezone.now())

Result

TIME_ZONE='UTC', USE_TZ=True
2018-02-13 09:10:49.715005
2018-02-13 09:10:49.715018+00:00

.TIME_ZONE='UTC', USE_TZ=False
2018-02-13 09:10:49.715970
2018-02-13 09:10:49.715980

.TIME_ZONE='Asia/Seoul', USE_TZ=True
2018-02-13 18:10:49.716758
2018-02-13 09:10:49.716769+00:00

.TIME_ZONE='Asia/Seoul', USE_TZ=False
2018-02-13 18:10:49.717475
2018-02-13 18:10:49.717486

As you can see here, both print out UTC time under TIME_ZONE='UTC', USE_TZ=True condition.

The other settings seem work well.

Or, Did I miss something?

Django Unit test : `freeze_time` not work well in some cases (Seems like a bug..?)

0 Answers0