Test whole remote backups through a fake ssh command

Real rsync runs over fake ssh and sshpass scripts that execute the remote side locally, covering --link-dest, removal, key file, password and --remote-sudo without a server.

tests/test_local.py

@@ -3,8 +3,7 @@
 import errno
 import io
 import os
-from collections.abc import Callable, Iterator
-from datetime import datetime, timedelta
+from collections.abc import Callable
 from pathlib import Path
 from shutil import which
 from typing import Any
@@ -16,25 +15,7 @@ from simple_backup import simple_backup as sb
 OPTIONS = '-r -v --ignore-missing-args --mkpath -a -h -H -X -s'
 
 
-@pytest.fixture(autouse=True)
-def fake_now(monkeypatch: pytest.MonkeyPatch) -> None:
-    """Give each backup a new timestamp, as real runs within the same second would collide"""
-
-    def times() -> Iterator[datetime]:
-        t = datetime(2026, 10, 14, 10, 0, 0)
-
-        while True:
-            yield t
-            t += timedelta(hours=1)
-
-    it = times()
-
-    class FakeDatetime:
-        @staticmethod
-        def now() -> datetime:
-            return next(it)
-
-    monkeypatch.setattr(sb, 'datetime', FakeDatetime)
+pytestmark = pytest.mark.usefixtures('fake_now')
 
 
 @pytest.fixture