Try monkey patch for test_find_backup_data_on_files

tests/test_backup_class.py

@@ -1,9 +1,17 @@
 import pytest
 from pathlib import Path
 
+from tibi_hardlinks.cache import Cache
 from tibi_hardlinks.backup_parser import read_backup_properties
+import tibi_hardlinks.backup_parser
 from tibi_hardlinks.backups import find_backup_data, Backup
 
 
-def test_find_backup_data_on_files(property_filepath):
+def test_find_backup_data_on_files(property_filepath, monkeypatch, tmp_path):
+    monkeypatch.setattr(tibi_hardlinks.backup_parser, "tibi_cache", Cache(tmp_path))
+    assert len(tibi_hardlinks.backup_parser.tibi_cache._store) == 0
     find_backup_data(property_filepath, read_backup_properties(property_filepath))
+
+
+def test_backup_class_init(property_filepath):
+    Backup(property_filepath)