fix(mail): quote IMAP mailbox commands

tests/test_imap_parser.py

@@ -1,14 +1,18 @@
 from __future__ import annotations
 
 import unittest
+from unittest.mock import patch
 
+from govoplan_mail.backend.config import ImapConfig
 from govoplan_mail.backend.sending.imap import (
     _detect_sent_folder,
     _extract_mailbox_name,
     _normalize_mailbox_page,
     _paged_descending_sequences,
     _parse_fetch_sequence,
+    _select_readonly,
     _sequence_set,
+    append_message_to_sent,
 )
 
 
@@ -69,5 +73,47 @@ class ImapMessagePaginationTests(unittest.TestCase):
         self.assertEqual(_normalize_mailbox_page(folder=" Sent ", limit=500, offset=3), ("Sent", 100, 3))
 
 
+class ImapMailboxCommandTests(unittest.TestCase):
+    def test_select_quotes_mailbox_name_with_spaces(self):
+        class Client:
+            untagged_responses = {"EXISTS": [b"0"], "UIDVALIDITY": [b"1"]}
+
+            def select(self, mailbox, readonly=False):
+                self.mailbox = mailbox
+                self.readonly = readonly
+                return "OK", [b"0"]
+
+            def response(self, code):
+                return "OK", [b"1"] if code == "UIDVALIDITY" else []
+
+        client = Client()
+
+        self.assertEqual(_select_readonly(client, "Gesendete Elemente"), (0, "1"))
+        self.assertEqual(client.mailbox, '"Gesendete Elemente"')
+        self.assertTrue(client.readonly)
+
+    def test_append_quotes_mailbox_name_with_spaces(self):
+        class Client:
+            def append(self, mailbox, flags, date_time, message):
+                self.mailbox = mailbox
+                self.flags = flags
+                self.date_time = date_time
+                self.message = message
+                return "OK", [b"APPEND completed"]
+
+            def logout(self):
+                return "BYE", [b"logged out"]
+
+        client = Client()
+        config = ImapConfig(host="imap.example.org", username="user", password="secret", sent_folder="auto")
+
+        with patch("govoplan_mail.backend.sending.imap._open_imap", return_value=client):
+            result = append_message_to_sent(b"Subject: test\r\n\r\nBody", imap_config=config, folder="Gesendete Elemente")
+
+        self.assertEqual(client.mailbox, '"Gesendete Elemente"')
+        self.assertEqual(result.folder, "Gesendete Elemente")
+        self.assertEqual(result.bytes_appended, len(b"Subject: test\r\n\r\nBody"))
+
+
 if __name__ == "__main__":
     unittest.main()