Add failing regression test

python · brandtbucher · May 12, 2025 · May 7, 2025 · May 7, 2025 · May 7, 2025
commit b59d86edc393d6af21d4ab673997c8f8fe037aa7
diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
@@ -989,6 +989,18 @@ class MyDict(dict):
            pass
        self._tracked(MyDict())

+    @support.cpython_only
+    def test_track_lazy_instance_dicts(self):
+        class C:
+            pass
+        o = C()
+        d = o.__dict__
+        self._not_tracked(d)
+        o.untracked = 42
+        self._not_tracked(d)
+        o.tracked = []
+        self._tracked(d)
+
    def make_shared_key_dict(self, n):
        class C:
            pass