Nested serializer tests

tests/test_serializer_nested.py

+from rest_framework import serializers
+
+
+class TestNestedSerializer:
+    def setup(self):
+        class NestedSerializer(serializers.Serializer):
+            one = serializers.IntegerField(max_value=10)
+            two = serializers.IntegerField(max_value=10)
+
+        class TestSerializer(serializers.Serializer):
+            nested = NestedSerializer()
+
+        self.Serializer = TestSerializer
+
+    def test_nested_validate(self):
+        input_data = {
+            'nested': {
+                'one': '1',
+                'two': '2',
+            }
+        }
+        expected_data = {
+            'nested': {
+                'one': 1,
+                'two': 2,
+            }
+        }
+        serializer = self.Serializer(data=input_data)
+        assert serializer.is_valid()
+        assert serializer.validated_data == expected_data
+
+    def test_nested_serialize_empty(self):
+        expected_data = {
+            'nested': {
+                'one': None,
+                'two': None
+            }
+        }
+        serializer = self.Serializer()
+        assert serializer.data == expected_data
+
 # """
 # Tests to cover nested serializers.