Fix validator tests to handle database-specific integer range validators

Author: browniebroke

tests/test_validators.py

@@ -4,7 +4,7 @@
 
 import pytest
 from django import VERSION as django_version
-from django.db import DataError, models
+from django.db import DataError, connection, models
 from django.test import TestCase
 
 from rest_framework import serializers
@@ -742,8 +742,11 @@ def test_single_field_uniq_validators(self):
         UniqueConstraint with single field must be transformed into
         field's UniqueValidator
         """
-        # Django 5 includes Max and Min values validators for IntegerField
-        extra_validators_qty = 2 if django_version[0] >= 5 else 0
+        # Backends like PostgreSQL add Min/Max validators for IntegerField;
+        # SQLite does not because it has no fixed integer range.
+        has_int_range = connection.ops.integer_field_range('IntegerField')[0] is not None
+        extra_validators_qty = 2 if has_int_range else 0
+
         serializer = UniqueConstraintSerializer()
         assert len(serializer.validators) == 2
         validators = serializer.fields['global_id'].validators