update for mcp

backend/tests/perception/test_notification_store.py

@@ -0,0 +1,83 @@
+"""Tests for the notification store's per-user read-state contract.
+
+These pin the core property that makes broadcast-to-everyone work without a
+subscription model: one notification row is shared by all users, and each
+user's read state is tracked independently against it.
+"""
+from __future__ import annotations
+
+from app.infrastructure.perception.mock_notification_store import MockNotificationStore
+
+
+def _store_with_one_notification() -> MockNotificationStore:
+    store = MockNotificationStore()
+    store.create(
+        event_id="evt-001",
+        kind="new",
+        title="《电动汽车安全要求》国家标准第三版正式发布",
+        impact_level="high",
+        summary=None,
+    )
+    return store
+
+
+def test_a_new_notification_is_unread_for_everyone():
+    """Nobody has read it yet, so unread_count is 1 for any user."""
+    store = _store_with_one_notification()
+    assert store.unread_count("user-a") == 1
+    assert store.unread_count("user-b") == 1
+
+
+def test_mark_all_read_zeroes_the_count_for_that_user():
+    """Reading clears the count for the user who read it."""
+    store = _store_with_one_notification()
+    marked = store.mark_all_read("user-a")
+    assert marked == 1
+    assert store.unread_count("user-a") == 0
+
+
+def test_one_users_read_state_does_not_affect_another():
+    """The whole point of read receipts over per-user fan-out: independence."""
+    store = _store_with_one_notification()
+    store.mark_all_read("user-a")
+    assert store.unread_count("user-a") == 0
+    assert store.unread_count("user-b") == 1
+
+
+def test_list_for_user_reports_the_read_flag_correctly():
+    """The list endpoint must reflect this user's own read state per item."""
+    store = _store_with_one_notification()
+    store.mark_all_read("user-a")
+
+    items_a = store.list_for_user("user-a")
+    items_b = store.list_for_user("user-b")
+
+    assert len(items_a) == 1
+    assert items_a[0]["read"] is True
+    assert items_b[0]["read"] is False
+
+
+def test_list_for_user_orders_newest_first():
+    """Notifications appear most-recent-first regardless of creation order."""
+    store = MockNotificationStore()
+    store.create(event_id="evt-1", kind="new", title="first", impact_level="low", summary=None)
+    store.create(event_id="evt-2", kind="new", title="second", impact_level="low", summary=None)
+
+    items = store.list_for_user("user-a")
+
+    assert [item["title"] for item in items] == ["second", "first"]
+
+
+def test_mark_all_read_is_a_no_op_on_an_empty_feed():
+    """Reading an empty feed must not raise and reports zero marked."""
+    store = MockNotificationStore()
+    assert store.mark_all_read("user-a") == 0
+
+
+def test_mark_all_read_does_not_recount_already_read_notifications():
+    """Calling mark_all_read twice must not double-count as newly marked."""
+    store = _store_with_one_notification()
+    first = store.mark_all_read("user-a")
+    second = store.mark_all_read("user-a")
+    assert first == 1
+    assert second == 0