Fixed #33127 -- Added error messages on | and & operators with combined querysets.

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/queries/test_qs_combinators.py b/tests/queries/test_qs_combinators.py
index 351a401902..89d08ef6db 100644
--- a/tests/queries/test_qs_combinators.py
+++ b/tests/queries/test_qs_combinators.py
@@ -441,3 +441,24 @@ class QuerySetSetOperationTests(TestCase):
             with self.subTest(combinator=combinator):
                 with self.assertRaisesMessage(NotSupportedError, msg % combinator):
                     getattr(qs, combinator)(qs).get(num=2)
+
+    def test_operator_on_combined_qs_error(self):
+        qs = Number.objects.all()
+        msg = 'Cannot use %s operator with combined queryset.'
+        combinators = ['union']
+        if connection.features.supports_select_difference:
+            combinators.append('difference')
+        if connection.features.supports_select_intersection:
+            combinators.append('intersection')
+        operators = [
+            ('|', operator.or_),
+            ('&', operator.and_),
+        ]
+        for combinator in combinators:
+            combined_qs = getattr(qs, combinator)(qs)
+            for operator_, operator_func in operators:
+                with self.subTest(combinator=combinator):
+                    with self.assertRaisesMessage(TypeError, msg % operator_):
+                        operator_func(qs, combined_qs)
+                    with self.assertRaisesMessage(TypeError, msg % operator_):
+                        operator_func(combined_qs, qs)