Fixed #24148 -- Documented a bug with case expressions in SQLite < 3.7.0

tests/expressions_case/tests.py

@@ -7,7 +7,7 @@ import unittest
 from uuid import UUID
 
 from django.core.exceptions import FieldError
-from django.db import models
+from django.db import connection, models
 from django.db.models import F, Q, Value, Min, Max
 from django.db.models.expressions import Case, When
 from django.test import TestCase
@@ -254,6 +254,12 @@ class CaseExpressionTests(TestCase):
             transform=attrgetter('integer', 'test')
         )
 
+    if connection.vendor == 'sqlite' and connection.Database.sqlite_version_info < (3, 7, 0):
+        # There is a bug in sqlite < 3.7.0, where placeholder order is lost.
+        # Thus, the above query returns  <condition_value> + <result_value>
+        # for each matching case instead of <result_value> + 1 (#24148).
+        test_combined_expression = unittest.expectedFailure(test_combined_expression)
+
     def test_in_subquery(self):
         self.assertQuerysetEqual(
             CaseTestModel.objects.filter(