gh-132285: Add a test when __annotations__ is deleted

sobolevn · sobolevn · commit 43185fb9395b · 2025-04-09T00:17:24.000+03:00
diff --git a/Lib/test/test_annotationlib.py b/Lib/test/test_annotationlib.py
@@ -809,6 +809,24 @@ def f(x: int):
             {"x": "int"},
         )
 
+    def test_del_annotations(self):
+        # gh-132285
+        called = False
+        class A:
+            def __annotate__(format):
+                nonlocal called
+                called = True
+                return {'a': int}
+
+        self.assertEqual(A.__annotations__, {'a': int})
+        self.assertTrue(called)
+
+        del A.__annotations__
+        called = False
+
+        self.assertEqual(A.__annotations__, {'a': int})
+        self.assertTrue(called)
+
     def test_non_dict_annotations(self):
         class WeirdAnnotations:
             @property
