[1.6.x] Fixed #21074 -- Added tests for localized datetime fields.

Fields must render values in the current time zone.

This commit only contains tests because this ticket was just a symptom of
a regression from #18777 that was fixed separately.

Backport of 5444a9c from master.

tests/timezones/forms.py

@@ -8,7 +8,16 @@ class EventForm(forms.Form):
 class EventSplitForm(forms.Form):
     dt = forms.SplitDateTimeField()
 
+class EventLocalizedForm(forms.Form):
+    dt = forms.DateTimeField(localize=True)
+
 class EventModelForm(forms.ModelForm):
     class Meta:
         model = Event
         fields = '__all__'
+
+class EventLocalizedModelForm(forms.ModelForm):
+    class Meta:
+        model = Event
+        fields = '__all__'
+        localized_fields = '__all__'

tests/timezones/tests.py

@@ -27,7 +27,7 @@ from django.utils import timezone
 from django.utils.tzinfo import FixedOffset
 from django.utils.unittest import skipIf, skipUnless
 
-from .forms import EventForm, EventSplitForm, EventModelForm
+from .forms import EventForm, EventSplitForm, EventLocalizedForm, EventModelForm, EventLocalizedModelForm
 from .models import Event, MaybeEvent, Session, SessionEvent, Timestamp, AllDayEvent
 
 
@@ -1036,12 +1036,24 @@ class NewFormsTests(TestCase):
         self.assertTrue(form.is_valid())
         self.assertEqual(form.cleaned_data['dt'], datetime.datetime(2011, 9, 1, 10, 20, 30, tzinfo=UTC))
 
+    @requires_tz_support
+    def test_localized_form(self):
+        form = EventLocalizedForm(initial={'dt': datetime.datetime(2011, 9, 1, 13, 20, 30, tzinfo=EAT)})
+        with timezone.override(ICT):
+            self.assertIn("2011-09-01 17:20:30", str(form))
+
     @requires_tz_support
     def test_model_form(self):
         EventModelForm({'dt': '2011-09-01 13:20:30'}).save()
         e = Event.objects.get()
         self.assertEqual(e.dt, datetime.datetime(2011, 9, 1, 10, 20, 30, tzinfo=UTC))
 
+    @requires_tz_support
+    def test_localized_model_form(self):
+        form = EventLocalizedModelForm(instance=Event(dt=datetime.datetime(2011, 9, 1, 13, 20, 30, tzinfo=EAT)))
+        with timezone.override(ICT):
+            self.assertIn("2011-09-01 17:20:30", str(form))
+
 
 @override_settings(DATETIME_FORMAT='c', TIME_ZONE='Africa/Nairobi', USE_L10N=False, USE_TZ=True,
                   PASSWORD_HASHERS=('django.contrib.auth.hashers.SHA1PasswordHasher',))