first commit

backend/tests/test_email_helpers.py

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+from datetime import datetime, timezone
+
+from bson import ObjectId
+
+from app.routers.emails import decode_cursor, encode_cursor, summarize
+
+
+def test_cursor_round_trip_preserves_sort_key():
+    entry = {
+        "_id": ObjectId(),
+        "created_at": datetime(2026, 8, 9, 12, 30, tzinfo=timezone.utc),
+    }
+
+    created_at, entry_id = decode_cursor(encode_cursor(entry))
+
+    assert created_at == entry["created_at"]
+    assert entry_id == entry["_id"]
+
+
+def test_summary_uses_account_mailbox_read_state():
+    now = datetime(2026, 8, 9, 12, 30, tzinfo=timezone.utc)
+    message_id = ObjectId()
+    message = {
+        "_id": message_id,
+        "direction": "inbound",
+        "sender": {"name": "Sender", "address": "sender@example.com"},
+        "to": [{"name": "user", "address": "user@getall.help"}],
+        "subject": "Hello",
+        "snippet": "A short preview",
+        "status": "received",
+        "created_at": now,
+        "received_at": now,
+        "attachments": [],
+    }
+    entry = {
+        "_id": ObjectId(),
+        "message_id": message_id,
+        "mailbox": "inbox",
+        "is_read": False,
+        "trashed_at": None,
+        "created_at": now,
+    }
+
+    result = summarize(message, entry)
+
+    assert result.id == str(message_id)
+    assert result.is_read is False
+    assert result.mailbox == "inbox"
+    assert result.snippet == "A short preview"