diff --git a/tests/models.py b/tests/models.py
index fe064b46a..1a3f35a50 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -184,3 +184,9 @@ class NullableOneToOneSource(RESTFrameworkModel):
 class BasicModelSerializer(serializers.ModelSerializer):
     class Meta:
         model = BasicModel
+
+class PartialUpdateModel(RESTFrameworkModel):
+    text = models.CharField(max_length=100)
+    extra = models.CharField(max_length=100)
+    textra = models.CharField(max_length=100)
+    text_extra = models.CharField(max_length=100)