Fix inconsisent filesytem tests on some platforms

tests/ios_fs/test_filesystem.py

@@ -2,25 +2,32 @@
 # Copyright (c) 2021-2023 Claudio Guarnieri.
 # Use of this software is governed by the MVT License 1.1 that can be found at
 #   https://license.mvt.re/1.1/
-
+import pytest
 import logging
 
 from mvt.common.indicators import Indicators
 from mvt.common.module import run_module
 from mvt.ios.modules.fs.filesystem import Filesystem
 
-from ..utils import get_ios_backup_folder
+from ..utils import get_ios_backup_folder, delete_tmp_db_files
+
+
+@pytest.fixture()
+def cleanup_tmp_artifacts():
+    ios_backup_folder = get_ios_backup_folder()
+    delete_tmp_db_files(ios_backup_folder)
+    return
 
 
 class TestFilesystem:
-    def test_filesystem(self):
+    def test_filesystem(self, cleanup_tmp_artifacts):
         m = Filesystem(target_path=get_ios_backup_folder())
         run_module(m)
         assert len(m.results) == 14
         assert len(m.timeline) == 14
         assert len(m.detected) == 0
 
-    def test_detection(self, indicator_file):
+    def test_detection(self, indicator_file, cleanup_tmp_artifacts):
         m = Filesystem(target_path=get_ios_backup_folder())
         ind = Indicators(log=logging.getLogger())
         ind.parse_stix2(indicator_file)

tests/utils.py

@@ -37,6 +37,18 @@ def get_indicator_file():
     print("PYTEST env", os.getenv("PYTEST_CURRENT_TEST"))
 
 
+def delete_tmp_db_files(file_path):
+    """
+    Remove Sqlite temporary files that appear on some platforms
+
+    These can cause filesystem tests to fail depending on the OS.
+    """
+    for file_name in ["Manifest.db-wal", "Manifest.db-shm"]:
+        path = os.path.join(file_path, file_name)
+        if os.path.isfile(path):
+            os.remove(path)
+
+
 def list_files(path: str):
     files = []
     parent_path = Path(path).absolute().parent.as_posix()