fix(mailu): extend backup/restore seed to cover /mail Maildir volume (ADV-mailu-01)

tests/mailu/test_restore.py

@@ -1,8 +1,9 @@
-"""mailu — RESTORE overlay: assert the seeded mailbox is back after restore.
+"""mailu — RESTORE overlay: assert both the seeded mailbox (sqlite /data) and the injected
+mail message (imap /mail) are back after restore.
 
-ops.pre_restore deleted citest@<domain> from the admin sqlite to simulate data loss; this
-overlay verifies that abra app restore brings the user back (the /data sqlite volume is
-restored from the backup taken by pre_backup, which contained the seeded user)."""
+ops.pre_restore deleted the user from sqlite AND wiped the maildir to simulate full data
+loss on both volumes; this overlay asserts that abra app restore brings back both the
+account record (from /data) and the stored message (from /mail)."""
 
 from __future__ import annotations
 
@@ -12,7 +13,11 @@ import sys
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "functional"))
 import _mailu  # noqa: E402
 
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
+from harness import lifecycle  # noqa: E402
+
 _CI_LOCALPART = "citest"
+_CI_MAIL_SUBJECT = "ccci-backup-probe"
 
 
 def test_restore_returns_mailbox(live_app):
@@ -21,6 +26,19 @@ def test_restore_returns_mailbox(live_app):
     emails = _mailu.user_emails(cfg)
     assert email in emails, (
         f"seeded mailbox {email!r} not found in config-export after restore; "
-        f"restore did not return the pre-mutation mail data. "
+        f"the /data (sqlite) volume was not restored. "
         f"users present: {emails}"
     )
+
+
+def test_restore_returns_mail_message(live_app):
+    email = f"{_CI_LOCALPART}@{live_app}"
+    out = lifecycle.exec_in_app(
+        live_app,
+        ["sh", "-c", f"doveadm search -u '{email}' mailbox INBOX header subject '{_CI_MAIL_SUBJECT}'"],
+        service="imap",
+    )
+    assert out.strip(), (
+        f"test message {_CI_MAIL_SUBJECT!r} not found in INBOX for {email!r} after restore; "
+        f"the /mail (Maildir) volume was not restored from the backup snapshot"
+    )