From 37b55ef4d5d41916f7c9dfb2d81b55003739606d Mon Sep 17 00:00:00 2001
From: James Cooke <jamescooke@users.noreply.github.com>
Date: Thu, 9 Jan 2020 21:34:34 +0000
Subject: [PATCH] Add regression test for OverflowError in unique validation

---
 tests/test_model_serializer.py | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/tests/test_model_serializer.py b/tests/test_model_serializer.py
index fbb562792..54eebd9d3 100644
--- a/tests/test_model_serializer.py
+++ b/tests/test_model_serializer.py
@@ -12,7 +12,7 @@ from collections import OrderedDict
 
 import django
 import pytest
-from django.core.exceptions import ImproperlyConfigured
+from django.core.exceptions import ImproperlyConfigured, ValidationError
 from django.core.serializers.json import DjangoJSONEncoder
 from django.core.validators import (
     MaxValueValidator, MinLengthValidator, MinValueValidator
@@ -1305,3 +1305,33 @@ class Issue6751Test(TestCase):
         serializer.save()
 
         self.assertEqual(instance.char_field, 'value changed by signal')
+
+
+class OverflowModel(models.Model):
+    value = models.IntegerField(unique=True, validators=[
+        MaxValueValidator(9223372036854775807),
+    ])
+
+
+class Issue7314Test(TestCase):
+
+    def test_model(self):
+        """
+        Assert that Django can validate the overflow model.
+        """
+        with self.assertRaises(ValidationError):
+            OverflowModel(value=9223372036854775808).full_clean()
+
+    def test_serializer(self):
+        class TestSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = OverflowModel
+                fields = '__all__'
+
+            def validate_value(self, value):
+                assert False
+
+        serializer = TestSerializer(data={'value': 9223372036854775808})
+
+        with self.assertRaises(serializers.ValidationError):
+            serializer.is_valid(raise_exception=True)