fixup! add test

tests/test_fields.py

@@ -6,6 +6,7 @@
 from decimal import ROUND_DOWN, ROUND_UP, Decimal
 
 import pytest
+from django.core.exceptions import ValidationError as DjangoValidationError
 from django.http import QueryDict
 from django.test import TestCase, override_settings
 from django.utils import six
@@ -2090,16 +2091,19 @@ class ExampleSerializer(serializers.Serializer):
 
 
 class TestValidationErrorCode:
-    def test_validationerror_code(self):
-        from django.core.exceptions import (
-            ValidationError as DjangoValidationError)
+    @pytest.mark.parametrize('use_list', (False, True))
+    def test_validationerror_code(self, use_list):
 
         class ExampleSerializer(serializers.Serializer):
             password = serializers.CharField()
 
             def validate_password(self, obj):
-                raise DjangoValidationError('exc_msg', 'exc_code')
+                err = DjangoValidationError('exc_msg', code='exc_code')
+                if use_list:
+                    err = DjangoValidationError([err])
+                raise err
 
         serializer = ExampleSerializer(data={'password': 123})
         serializer.is_valid()
+        assert serializer.errors == {'password': ['exc_msg']}
         assert serializer.errors['password'][0].code == 'exc_code'