introduce "mailboxes_dir" config ini option to avoid hardcoding /home/vmail/mail/....

in source code and to improve testability.

chatmaild/src/chatmaild/tests/test_delete_inactive_users.py

@@ -1,4 +1,5 @@
 import time
+from pathlib import Path
 
 from chatmaild.delete_inactive_users import delete_inactive_users
 from chatmaild.doveauth import lookup_passdb
@@ -8,9 +9,12 @@ def test_remove_stale_users(db, example_config):
     new = time.time()
     old = new - (example_config.delete_inactive_users_after * 86400) - 1
 
+    def get_user_path(addr):
+        return Path(example_config.get_user_maildir(addr))
+
     def create_user(addr, last_login):
         lookup_passdb(db, example_config, addr, "q9mr3faue", last_login=last_login)
-        md = example_config.get_user_maildir(addr)
+        md = get_user_path(addr)
         md.mkdir(parents=True)
         md.joinpath("cur").mkdir()
         md.joinpath("cur", "something").mkdir()
@@ -33,19 +37,19 @@ def test_remove_stale_users(db, example_config):
     # check pre and post-conditions for delete_inactive_users()
 
     for addr in to_remove:
-        assert example_config.get_user_maildir(addr).exists()
+        assert get_user_path(addr).exists()
 
     delete_inactive_users(db, example_config)
 
-    for p in example_config.mail_basedir.iterdir():
+    for p in Path(example_config.mailboxes_dir).iterdir():
         assert not p.name.startswith("old")
 
     for addr in to_remove:
+        assert not get_user_path(addr).exists()
         with db.read_connection() as conn:
             assert not conn.get_user(addr)
-            assert not example_config.get_user_maildir(addr).exists()
 
     for addr in remain:
-        assert example_config.get_user_maildir(addr).exists()
+        assert get_user_path(addr).exists()
         with db.read_connection() as conn:
             assert conn.get_user(addr)