diff --git a/tests/test_model/test_reftek/test_header.py b/tests/test_model/test_reftek/test_header.py
index b73e3d18356e39d2efd68aeeefa5782c71f7d829..0058679bd536a1b7febbf2165c02b096f8624feb 100644
--- a/tests/test_model/test_reftek/test_header.py
+++ b/tests/test_model/test_reftek/test_header.py
@@ -45,7 +45,6 @@ class TestParseRT130Time(unittest.TestCase):
             self.assertEqual(result.year, 1950)
 
 
-
 class TestGetRT130PacketHeader(unittest.TestCase):
     def test_header_extracted_correctly(self):
         header = b'DT\x12\x15\x98\xe1\x36\x01\x15\x13\x51\x35\x05\x12\x01\x11'
@@ -71,4 +70,3 @@ class TestGetRT130PacketHeader(unittest.TestCase):
         packet = header + b' ' * 1008
         with self.assertRaises(NotRT130FileError):
             get_rt130_packet_header(packet)
-
diff --git a/tests/test_model/test_reftek/test_packet_readers.py b/tests/test_model/test_reftek/test_packet_readers.py
index 180e03b445f6f71e92ff4f3dca9a22ce5f4f5f5c..686ac4528873c88c8e01f9320b6a8860bd106bc5 100644
--- a/tests/test_model/test_reftek/test_packet_readers.py
+++ b/tests/test_model/test_reftek/test_packet_readers.py
@@ -4,8 +4,7 @@ from unittest.mock import patch
 from sohstationviewer.model.mseed_data.record_reader_helper import Unpacker
 from sohstationviewer.model.reftek.reftek_data.packet import \
     eh_et_payload_end_in_packet
-from sohstationviewer.model.reftek.reftek_data.packet_readers import \
-    (
+from sohstationviewer.model.reftek.reftek_data.packet_readers import (
     decode_uncompressed, decode_compressed, read_dt_packet, read_eh_et_packet,
     read_soh_packet,
 )
diff --git a/tests/test_model/test_reftek/test_reftek_helper.py b/tests/test_model/test_reftek/test_reftek_helper.py
index ecf16f80e5d43b44e737371b70d58296f2fab525..f4410699448e5b6a14ca48656dbbfbc80c5b8201 100644
--- a/tests/test_model/test_reftek/test_reftek_helper.py
+++ b/tests/test_model/test_reftek/test_reftek_helper.py
@@ -7,16 +7,14 @@ from obspy.io.reftek.packet import PACKET_FINAL_DTYPE
 
 from sohstationviewer.model.mseed_data.record_reader_helper import Unpacker
 from sohstationviewer.model.reftek.reftek_data.header import NotRT130FileError
-from sohstationviewer.model.reftek.reftek_data.packet_readers import \
-    (
+from sohstationviewer.model.reftek.reftek_data.packet_readers import (
     read_eh_et_packet, read_dt_packet, read_soh_packet,
 )
 from sohstationviewer.model.reftek.reftek_data.packets import (
     SOHPacket,
     EHETPacket, DTPacket,
 )
-from sohstationviewer.model.reftek.reftek_data.reftek_helper import \
-    (
+from sohstationviewer.model.reftek.reftek_data.reftek_helper import (
     read_rt130_file, convert_packet_to_obspy_format,
 )
 
@@ -104,4 +102,3 @@ class TestConvertPacketToObspyFormat(unittest.TestCase):
         )
 
         self.assertEqual(len(converted_packet), len(PACKET_FINAL_DTYPE))
-