Ticket #29155: 29155-test.diff

tests/db_functions/tests.py

@@ -3 +3 @@
 from unittest import skipIf, skipUnless
 
 from django.db import connection
-from django.db.models import CharField, TextField, Value as V
+from django.db.models import CharField, F, TextField, Value as V
 from django.db.models.expressions import RawSQL
 from django.db.models.functions import (
     Coalesce, Concat, ConcatPair, Greatest, Least, Length, Lower, Now,
@@ -519 +519 @@
             lambda a: a.name_part
         )
 
+    def test_substr_with_startswith(self):
+        a = Author.objects.create(name='John Smith', alias='John')
+        authors = Author.objects.filter(name__startswith=Substr(F('alias'), 1, 3))
+        self.assertCountEqual(authors, [a])
+
     def test_nested_function_ordering(self):
         Author.objects.create(name='John Smith')
         Author.objects.create(name='Rhonda Simpson', alias='ronny')