added utc compat to tests of fields

tests/test_fields.py

@@ -8,11 +8,12 @@ from decimal import Decimal
 import pytest
 from django.http import QueryDict
 from django.test import TestCase, override_settings
-from django.utils import six, timezone
+from django.utils import six,
 
 import rest_framework
 from rest_framework import serializers
 from rest_framework.fields import is_simple_callable
+from rest_framework.compat import utc
 
 try:
     import typings
@@ -1129,13 +1130,13 @@ class TestDateTimeField(FieldValues):
     Valid and invalid values for `DateTimeField`.
     """
     valid_inputs = {
-        '2001-01-01 13:00': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        '2001-01-01T13:00': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        '2001-01-01T13:00Z': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        datetime.datetime(2001, 1, 1, 13, 00): datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
+        '2001-01-01 13:00': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc),
+        '2001-01-01T13:00': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc),
+        '2001-01-01T13:00Z': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc),
+        datetime.datetime(2001, 1, 1, 13, 00): datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc),
+        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc): datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc),
         # Django 1.4 does not support timezone string parsing.
-        '2001-01-01T13:00Z': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC())
+        '2001-01-01T13:00Z': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc)
     }
     invalid_inputs = {
         'abc': ['Datetime has wrong format. Use one of these formats instead: YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HH:MM|-HH:MM|Z].'],
@@ -1144,13 +1145,13 @@ class TestDateTimeField(FieldValues):
     }
     outputs = {
         datetime.datetime(2001, 1, 1, 13, 00): '2001-01-01T13:00:00',
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): '2001-01-01T13:00:00Z',
+        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc): '2001-01-01T13:00:00Z',
         '2001-01-01T00:00:00': '2001-01-01T00:00:00',
         six.text_type('2016-01-10T00:00:00'): '2016-01-10T00:00:00',
         None: None,
         '': None,
     }
-    field = serializers.DateTimeField(default_timezone=timezone.UTC())
+    field = serializers.DateTimeField(default_timezone=utc)
 
 
 class TestCustomInputFormatDateTimeField(FieldValues):
@@ -1158,13 +1159,13 @@ class TestCustomInputFormatDateTimeField(FieldValues):
     Valid and invalid values for `DateTimeField` with a custom input format.
     """
     valid_inputs = {
-        '1:35pm, 1 Jan 2001': datetime.datetime(2001, 1, 1, 13, 35, tzinfo=timezone.UTC()),
+        '1:35pm, 1 Jan 2001': datetime.datetime(2001, 1, 1, 13, 35, tzinfo=utc),
     }
     invalid_inputs = {
         '2001-01-01T20:50': ['Datetime has wrong format. Use one of these formats instead: hh:mm[AM|PM], DD [Jan-Dec] YYYY.']
     }
     outputs = {}
-    field = serializers.DateTimeField(default_timezone=timezone.UTC(), input_formats=['%I:%M%p, %d %b %Y'])
+    field = serializers.DateTimeField(default_timezone=utc, input_formats=['%I:%M%p, %d %b %Y'])
 
 
 class TestCustomOutputFormatDateTimeField(FieldValues):
@@ -1196,7 +1197,7 @@ class TestNaiveDateTimeField(FieldValues):
     Valid and invalid values for `DateTimeField` with naive datetimes.
     """
     valid_inputs = {
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): datetime.datetime(2001, 1, 1, 13, 00),
+        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=utc): datetime.datetime(2001, 1, 1, 13, 00),
         '2001-01-01 13:00': datetime.datetime(2001, 1, 1, 13, 00),
     }
     invalid_inputs = {}