Refs #32632 -- Added tests for returning a copy when combining Q() objects.

tests/queries/test_q.py

@@ -26,6 +26,19 @@ class QTests(SimpleTestCase):
         self.assertEqual(q | Q(), q)
         self.assertEqual(Q() | q, q)
 
+    def test_combine_empty_copy(self):
+        base_q = Q(x=1)
+        tests = [
+            base_q | Q(),
+            Q() | base_q,
+            base_q & Q(),
+            Q() & base_q,
+        ]
+        for i, q in enumerate(tests):
+            with self.subTest(i=i):
+                self.assertEqual(q, base_q)
+                self.assertIsNot(q, base_q)
+
     def test_combine_or_both_empty(self):
         self.assertEqual(Q() | Q(), Q())