fix dirwalk tests by explicitly setting mtime

tests/test_monster.py

@@ -8,9 +8,10 @@
 # fun reading these tests as I had in writing them!
 
 import datetime
-import time
+import os
 import pathlib
 import pytest
+import time
 
 from .common import TestCommon
 from stempelwerk.DirWalk.DirWalk import dirwalk
@@ -53,6 +54,11 @@
     TEST_FILES_AND_DIRS.append(entry)
 
 
+def set_mtime_to_current_time(dir_path):
+    for path_in_directory in dirwalk(dir_path, include_directories=True):
+        os.utime(path_in_directory, times=None)
+
+
 class TestMonster(TestCommon):
 
     @pytest.mark.datafiles(FIXTURE_DIR)
@@ -419,8 +425,8 @@ def test_excluded_files_9(self, datafiles):
 
     @pytest.mark.datafiles(FIXTURE_DIR)
     def test_modified_1(self, datafiles):
-        # work around the peculiarities of "pytest-datafiles"
-        modified_since = datetime.datetime.now() - datetime.timedelta(days=2)
+        modified_since = datetime.datetime.now()
+        set_mtime_to_current_time(datafiles)
 
         actual_paths = dirwalk(
             datafiles,
@@ -433,8 +439,8 @@ def test_modified_1(self, datafiles):
 
     @pytest.mark.datafiles(FIXTURE_DIR)
     def test_modified_1_in_between(self, datafiles):
-        # work around the peculiarities of "pytest-datafiles"
-        modified_since = datetime.datetime.now() - datetime.timedelta(days=2)
+        modified_since = datetime.datetime.now()
+        set_mtime_to_current_time(datafiles)
 
         actual_paths = dirwalk(
             datafiles,