fix: bound long-lived cache state

tests/test_webpush_subscription.py

@@ -0,0 +1,61 @@
+import unittest
+from types import SimpleNamespace
+
+from app.core.config import global_vars
+from app.helper.webpush import is_webpush_subscription_gone
+
+
+class WebPushSubscriptionTest(unittest.TestCase):
+    def setUp(self):
+        """清理跨用例共享的 WebPush 订阅。"""
+        with global_vars.SUBSCRIPTIONS_LOCK:
+            global_vars.SUBSCRIPTIONS.clear()
+
+    def tearDown(self):
+        """清理测试产生的 WebPush 订阅。"""
+        with global_vars.SUBSCRIPTIONS_LOCK:
+            global_vars.SUBSCRIPTIONS.clear()
+
+    def test_push_subscription_upserts_by_endpoint(self):
+        """相同 endpoint 的 WebPush 订阅应更新而不是重复追加。"""
+        global_vars.push_subscription(
+            {"endpoint": "https://push.example/a", "keys": {"p256dh": "old"}}
+        )
+        global_vars.push_subscription(
+            {"endpoint": "https://push.example/a", "keys": {"p256dh": "new"}}
+        )
+
+        subscriptions = global_vars.get_subscriptions()
+
+        self.assertEqual(1, len(subscriptions))
+        self.assertEqual("new", subscriptions[0]["keys"]["p256dh"])
+
+    def test_remove_subscription_deletes_by_endpoint(self):
+        """失效订阅应能按 endpoint 从全局订阅表删除。"""
+        subscription = {"endpoint": "https://push.example/a", "keys": {}}
+        global_vars.push_subscription(subscription)
+
+        self.assertTrue(global_vars.remove_subscription(subscription))
+        self.assertEqual([], global_vars.get_subscriptions())
+
+    def test_is_webpush_subscription_gone_matches_404_and_410(self):
+        """推送服务返回 404/410 时应识别为订阅已失效。"""
+        self.assertTrue(
+            is_webpush_subscription_gone(
+                SimpleNamespace(response=SimpleNamespace(status_code=410))
+            )
+        )
+        self.assertTrue(
+            is_webpush_subscription_gone(
+                SimpleNamespace(response=SimpleNamespace(status=404))
+            )
+        )
+        self.assertFalse(
+            is_webpush_subscription_gone(
+                SimpleNamespace(response=SimpleNamespace(status_code=500))
+            )
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()