diff --git a/src/tests/test_io/test_importers/data_files/ASCII_Header/header_#.csv b/src/tests/test_io/test_importers/data_files/ASCII_Header/header_#.csv
index 63e43fae2170e422b9fb95a3d0feb52007fc095a..4aeec9406234911f8790b10b09c1539d382a89ef 100644
--- a/src/tests/test_io/test_importers/data_files/ASCII_Header/header_#.csv
+++ b/src/tests/test_io/test_importers/data_files/ASCII_Header/header_#.csv
@@ -2,9 +2,9 @@
 ## It continues at the next line.
 ## And another line
 ## with newline.
-#voltage, 5 V
-#speed: 6 m/s
-#septab	7
+# voltage, 5 V
+# speed: 6 m/s
+# septab	7
 time	values
 +1.280000e+002	   -4.078996e+001
 +2.560000e+002	   -5.155923e+001
diff --git a/src/tests/test_io/test_importers/test_data_container_csv/test_data_container_csv.py b/src/tests/test_io/test_importers/test_data_container_csv/test_data_container_csv.py
index 7cb8f831bdc9bcc8f0897a972d168fbf20076673..c5529866fe067e5b64ade8d35468ae62a71de9b9 100644
--- a/src/tests/test_io/test_importers/test_data_container_csv/test_data_container_csv.py
+++ b/src/tests/test_io/test_importers/test_data_container_csv/test_data_container_csv.py
@@ -8,13 +8,13 @@ from openqlab.io.importers.data_container_csv import DataContainerCSV
 from openqlab.io.importers.utils import ImportFailed, UnknownFileType
 
 filedir = Path(__file__).parent
-datadir = f"{filedir}/../data_files"
+datadir = filedir / "../data_files"
 
 
 class TestDataContainerCSV(unittest.TestCase):
     importer = DataContainerCSV
-    files_path = Path(datadir)
-    supported_files_path = Path(fr"{datadir}/DataContainerCSV")
+    files_path = datadir
+    supported_files_path = datadir / "DataContainerCSV"
 
     def read_file(self, file):
         try: