add failing test to demonstrate nested serializer QueryDict problem

tests/test_serializer_nested.py

@@ -1,3 +1,4 @@
+from django.http import QueryDict
 from rest_framework import serializers
 
 
@@ -29,6 +30,26 @@ class TestNestedSerializer:
         assert serializer.is_valid()
         assert serializer.validated_data == expected_data
 
+    def test_nested_query_dict_validate(self):
+        input_data = {
+            'nested': {
+                'one': '1',
+                'two': '2',
+            }
+        }
+        input_data_q_dict = QueryDict('', mutable=True)
+        input_data_q_dict.update(input_data)
+
+        expected_data = {
+            'nested': {
+                'one': 1,
+                'two': 2,
+            }
+        }
+        serializer = self.Serializer(data=input_data_q_dict)
+        assert serializer.is_valid()
+        assert serializer.validated_data == expected_data
+
     def test_nested_serialize_empty(self):
         expected_data = {
             'nested': {