1 files changed, 10 insertions, 0 deletions
diff --git a/rest_framework/tests/serializer.py b/rest_framework/tests/serializer.py
index 08a7a9d0..4454791b 100644
--- a/rest_framework/tests/serializer.py
+++ b/rest_framework/tests/serializer.py
@@ -1,3 +1,4 @@
+import copy
 import datetime
 from django.test import TestCase
 from rest_framework import serializers
@@ -93,6 +94,15 @@ class ValidationTests(TestCase):
         self.assertEquals(serializer.is_valid(), False)
         self.assertEquals(serializer.errors, {'content': [u'Ensure this value has at most 1000 characters (it has 1001).']})
 
+    def test_update_missing_field(self):
+        data = {
+            'content': 'xxx',
+            'created': datetime.datetime(2012, 1, 1)
+        }
+        serializer = CommentSerializer(data, instance=self.comment)
+        self.assertEquals(serializer.is_valid(), False)
+        self.assertEquals(serializer.errors, {'email': [u'This field is required.']})
+
 
 class MetadataTests(TestCase):
     def test_empty(self):