diff --git a/common/encfstools.py b/common/encfstools.py
index c82909437..cc28c320c 100644
--- a/common/encfstools.py
+++ b/common/encfstools.py
@@ -218,12 +218,8 @@ class EncFS_SSH(EncFS_mount):
     rsync will then sync the encrypted view on / to the remote path
     """
     def __init__(self, cfg = None, profile_id = None, mode = None, parent = None,*args, **kwargs):
-        self.config = cfg
-        if self.config is None:
-            self.config = config.Config()
-        self.profile_id = profile_id
-        if self.profile_id is None:
-            self.profile_id = self.config.currentProfile()
+        self.config = cfg or config.Config()
+        self.profile_id = profile_id or self.config.currentProfile()
         self.mode = mode
         if self.mode is None:
             self.mode = self.config.snapshotsMode(self.profile_id)
diff --git a/common/mount.py b/common/mount.py
index 357023cc1..b7af736e2 100644
--- a/common/mount.py
+++ b/common/mount.py
@@ -104,18 +104,18 @@ def postUmountCheck(self):
                 return True
 
 """
+import getpass
+import json
 import os
 import subprocess
-import json
-import getpass
-from zlib import crc32
 from time import sleep
+from zlib import crc32
 
 import config
 import logger
-import tools
 import password
-from exceptions import MountException, HashCollision
+import tools
+from exceptions import HashCollision, MountException
 
 
 class Mount(object):
@@ -143,14 +143,8 @@ def __init__(self,
                  profile_id = None,
                  tmp_mount = False,
                  parent = None):
-        self.config = cfg
-        if self.config is None:
-            self.config = config.Config()
-
-        self.profile_id = profile_id
-        if self.profile_id is None:
-            self.profile_id = self.config.currentProfile()
-
+        self.config = cfg or config.Config()
+        self.profile_id = profile_id or self.config.currentProfile()
         self.tmp_mount = tmp_mount
         self.parent = parent
 
@@ -437,13 +431,9 @@ def __init__(self,
         self.mountproc = None
         self.symlink_subfolder = None
 
-        self.config = cfg
-        if self.config is None:
-            self.config = config.Config()
+        self.config = cfg or config.Config()
 
-        self.profile_id = profile_id
-        if self.profile_id is None:
-            self.profile_id = self.config.currentProfile()
+        self.profile_id = profile_id or self.config.currentProfile()
 
         self.tmp_mount = tmp_mount
         self.hash_id = hash_id
diff --git a/common/test/constants.py b/common/test/constants.py
new file mode 100644
index 000000000..c3b2449a7
--- /dev/null
+++ b/common/test/constants.py
@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: © 2008-2022 Oprea Dan
+# SPDX-FileCopyrightText: © 2008-2022 Bart de Koning
+# SPDX-FileCopyrightText: © 2008-2022 Richard Bailey
+# SPDX-FileCopyrightText: © 2008-2022 Germar Reitze
+# SPDX-FileCopyrightText: © 2024 Ihor Pryyma
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# This file is part of the program "Back In Time" which is released under GNU
+# General Public License v2 (GPLv2).
+# See file LICENSE or go to <https://www.gnu.org/licenses/#GPL>.
+"""
+Constants that are used in the test files.
+"""
+import grp
+import os
+import pwd
+
+CURRENTUID = os.geteuid()
+CURRENTUSER = pwd.getpwuid(CURRENTUID).pw_name
+CURRENTGID = os.getegid()
+CURRENTGROUP = grp.getgrgid(CURRENTGID).gr_name
+CURRENTUID = os.geteuid()
+CURRENTGID = os.getegid()
diff --git a/common/test/test_applicationinstance.py b/common/test/test_applicationinstance.py
index c83ac5385..8af1b67bf 100644
--- a/common/test/test_applicationinstance.py
+++ b/common/test/test_applicationinstance.py
@@ -15,11 +15,12 @@
 # with this program; if not, write to the Free Software Foundation,Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-import subprocess
 import os
 import sys
+import subprocess
 from unittest.mock import patch
 from threading import Thread
+
 from test import generic
 
 sys.path.append(os.path.join(os.path.dirname(__file__), ".."))
@@ -70,9 +71,10 @@ def _createProcess(self):
 
     def _killProcess(self):
         if self.subproc:
-            self.subproc.kill()
-            self.subproc.wait()
-            self.subproc = None
+            subproc = self.subproc
+            subproc.kill()
+            subproc.wait()
+        self.subproc = None
 
     def test_create_and_remove_pid_file(self):
         # create pid file
diff --git a/common/test/test_config_crontab.py b/common/test/test_config_crontab.py
index 9ed4366d0..693a68b72 100644
--- a/common/test/test_config_crontab.py
+++ b/common/test/test_config_crontab.py
@@ -1,32 +1,27 @@
-# Back In Time
-# Copyright (C) 2024 Kosta Vukicevic, Christian Buhtz
+# SPDX-FileCopyrightText: © 2024 Christian Buhtz <c.buhtz@posteo.jp>
+# SPDX-FileCopyrightText: © 2024 Kosta Vukicevic
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; if not, write to the Free Software Foundation,Inc.,
-# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# This file is part of the program "Back In Time" which is released under GNU
+# General Public License v2 (GPLv2).
+# See file LICENSE or go to <https://www.gnu.org/licenses/#GPL>.
 """Tests about Cron-related behavior of the config module.
 
 See also test_schedule.py for low-level-Cron-behavior implemented in schedule
 module."""
-import unittest
-import pyfakefs.fake_filesystem_unittest as pyfakefs_ut
-import sys
+import inspect
 import os
+import sys
 import tempfile
-import inspect
+import unittest
 from pathlib import Path
 from unittest import mock
+
+import pyfakefs.fake_filesystem_unittest as pyfakefs_ut
+
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
+
 import config
 
 
@@ -80,6 +75,7 @@ def setUp(self):
 
     def _create_config_file(self, parent_path):
         """Minimal config file"""
+        # pylint: disable-next=R0801
         cfg_content = inspect.cleandoc('''
             config.version=6
             profile1.snapshots.include.1.type=0
diff --git a/common/test/test_lint.py b/common/test/test_lint.py
index c537bb3f9..95d9e13ea 100644
--- a/common/test/test_lint.py
+++ b/common/test/test_lint.py
@@ -106,11 +106,12 @@ def test_with_pylint(self):
             'R0201',  # no-self-use
             'R0202',  # no-classmethod-decorator
             'R0203',  # no-staticmethod-decorator
+            'R0801',  # duplicate-code
 
             # Enable asap. This list is a selection of existing (not all!)
             # problems currently existing in the BIT code base. Quite easy to fix
             # because their count is low.
-            # 'R0801',  # duplicate-code
+            # 'W0237',  # arguments-renamed
             # 'W0221',  # arguments-differ
             # 'W0603',  # global-statement
         ]
diff --git a/common/test/test_plugin_usercallback.py b/common/test/test_plugin_usercallback.py
index 9e0e54f0f..7213e485d 100644
--- a/common/test/test_plugin_usercallback.py
+++ b/common/test/test_plugin_usercallback.py
@@ -1,17 +1,18 @@
 import sys
 import inspect
-import tempfile
-from pathlib import Path
-import stat
 import io
 import unittest
 import unittest.mock as mock
+import tempfile
+import stat
 from contextlib import redirect_stdout, redirect_stderr
 from ast import literal_eval
+from pathlib import Path
 
 # This workaround will become obsolet when migrating to src-layout
 sys.path.append(str(Path(__file__).parent))
 sys.path.append(str(Path(__file__).parent / 'plugins'))
+
 import pluginmanager
 from config import Config
 from snapshots import Snapshots
@@ -206,6 +207,8 @@ def _create_source_and_destination_folders(cls, parent_path):
 
     @classmethod
     def _create_config_file(cls, parent_path):
+        """Minimal config file"""
+        # pylint: disable-next=R0801
         cfg_content = inspect.cleandoc('''
             config.version=6
             profile1.snapshots.include.1.type=0
diff --git a/common/test/test_restore.py b/common/test/test_restore.py
index 97d1111fa..e66027927 100644
--- a/common/test/test_restore.py
+++ b/common/test/test_restore.py
@@ -18,20 +18,15 @@
 import os
 import sys
 import unittest
-import pwd
-import grp
 import stat
 from tempfile import TemporaryDirectory
+
 from test import generic
+from test.constants import CURRENTUSER, CURRENTGROUP
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 import mount
 
-CURRENTUID = os.geteuid()
-CURRENTUSER = pwd.getpwuid(CURRENTUID).pw_name
-
-CURRENTGID = os.getegid()
-CURRENTGROUP = grp.getgrgid(CURRENTGID).gr_name
 
 class RestoreTestCase(generic.SnapshotsWithSidTestCase):
     def setUp(self):
diff --git a/common/test/test_snapshots.py b/common/test/test_snapshots.py
index 7783567c3..925cfa898 100644
--- a/common/test/test_snapshots.py
+++ b/common/test/test_snapshots.py
@@ -14,13 +14,11 @@
 # You should have received a copy of the GNU General Public License along
 # with this program; if not, write to the Free Software Foundation,Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
 import os
 import sys
 import pathlib
 import shutil
 import stat
-import pwd
 import grp
 import re
 import random
@@ -30,6 +28,7 @@
 from datetime import date, datetime
 from tempfile import TemporaryDirectory
 from test import generic
+from test.constants import CURRENTUSER, CURRENTGROUP, CURRENTGID, CURRENTUID
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 import logger
@@ -38,11 +37,6 @@
 import tools
 import mount
 
-CURRENTUID = os.geteuid()
-CURRENTUSER = pwd.getpwuid(CURRENTUID).pw_name
-
-CURRENTGID = os.getegid()
-CURRENTGROUP = grp.getgrgid(CURRENTGID).gr_name
 
 # all groups the current user is member in
 GROUPS = [i.gr_name for i in grp.getgrall() if CURRENTUSER in i.gr_mem]
diff --git a/common/test/test_tools.py b/common/test/test_tools.py
index f9d31321b..87f47edc1 100644
--- a/common/test/test_tools.py
+++ b/common/test/test_tools.py
@@ -23,13 +23,13 @@
 import gzip
 import stat
 import signal
+from datetime import datetime
+from time import sleep
 from unittest.mock import patch
 from copy import deepcopy
 from tempfile import NamedTemporaryFile, TemporaryDirectory
-from datetime import datetime
-from test import generic
-from time import sleep
 import pyfakefs.fake_filesystem_unittest as pyfakefs_ut
+from test import generic
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 import tools
@@ -98,7 +98,7 @@ def _kill_process(self):
         if self.subproc:
             self.subproc.kill()
             self.subproc.wait()
-            self.subproc = None
+        self.subproc = None
 
     def test_sharePath(self):
         share = tools.sharePath()
diff --git a/qt/app.py b/qt/app.py
index d2fb9e008..c202f2c92 100644
--- a/qt/app.py
+++ b/qt/app.py
@@ -98,6 +98,7 @@
 import languagedialog
 import messagebox
 from aboutdlg import AboutDlg
+import qttools
 
 
 class MainWindow(QMainWindow):
@@ -878,13 +879,9 @@ def updateProfiles(self):
 
         self.comboProfiles.clear()
 
+        qttools.update_combo_profiles(self.config, self.comboProfiles, self.config.currentProfile())
         profiles = self.config.profilesSortedByName()
 
-        for profile_id in profiles:
-            self.comboProfiles.addProfileID(profile_id)
-            if profile_id == self.config.currentProfile():
-                self.comboProfiles.setCurrentProfileID(profile_id)
-
         self.comboProfilesAction.setVisible(len(profiles) > 1)
 
         self.updateProfile()
diff --git a/qt/logviewdialog.py b/qt/logviewdialog.py
index 117308c84..2cfd0e55e 100644
--- a/qt/logviewdialog.py
+++ b/qt/logviewdialog.py
@@ -31,6 +31,7 @@
 import encfstools
 import snapshotlog
 import tools
+import qttools
 
 
 class LogViewDialog(QDialog):
@@ -187,16 +188,12 @@ def updateProfiles(self):
 
         self.comboProfiles.clear()
 
-        profiles = self.config.profilesSortedByName()
-        for profile_id in profiles:
-            self.comboProfiles.addProfileID(profile_id)
-            if profile_id == current_profile_id:
-                self.comboProfiles.setCurrentProfileID(profile_id)
+        qttools.update_combo_profiles(self.config, self.comboProfiles, current_profile_id)
 
         self.enableUpdate = True
         self.updateLog()
 
-        if len(profiles) <= 1:
+        if len(self.config.profilesSortedByName()) <= 1:
             self.lblProfile.setVisible(False)
             self.comboProfiles.setVisible(False)
 
diff --git a/qt/qtsystrayicon.py b/qt/qtsystrayicon.py
index 4bcd3a9ec..67f1eb924 100644
--- a/qt/qtsystrayicon.py
+++ b/qt/qtsystrayicon.py
@@ -201,13 +201,13 @@ def updateInfo(self):
             self.menuProgress.setVisible(False)
 
     def getMenuProgress(self, pg):
-        d = (
+        data = (
             ('sent', _('Sent:')),
             ('speed', _('Speed:')),
             ('eta',    _('ETA:'))
         )
 
-        for key, txt in d:
+        for key, txt in data:
             value = pg.strValue(key, '')
 
             if not value:
diff --git a/qt/qttools.py b/qt/qttools.py
index 9938d461c..f1fdabec0 100644
--- a/qt/qttools.py
+++ b/qt/qttools.py
@@ -139,6 +139,21 @@ def set_wrapped_tooltip(widget: QWidget,
     widget.setToolTip('\n'.join(result))
 
 
+
+def update_combo_profiles(config, combo_profiles, current_profile_id):
+    """
+    Updates the combo box with profiles.
+
+    :param config: Configuration object with access to profile data.
+    :param combo_profiles: The combo box widget to be updated.
+    :param current_profile_id: The ID of the current profile to be selected.
+    """
+    profiles = config.profilesSortedByName()
+    for profile_id in profiles:
+        combo_profiles.addProfileID(profile_id)
+        if profile_id == current_profile_id:
+            combo_profiles.setCurrentProfileID(profile_id)
+
 # |---------------------|
 # | Misc / Uncatgorized |
 # |---------------------|
diff --git a/qt/settingsdialog.py b/qt/settingsdialog.py
index 6d15ec466..f870e2c58 100644
--- a/qt/settingsdialog.py
+++ b/qt/settingsdialog.py
@@ -67,6 +67,7 @@
 import schedulewidget
 from exceptions import MountException, NoPubKeyLogin, KnownHost
 from bitbase import URL_ENCRYPT_TRANSITION
+import qttools
 
 
 class SshProxyWidget(QWidget):
@@ -1192,13 +1193,13 @@ def profileChanged(self, index):
         if self.disableProfileChanged:
             return
 
-        profile_id = self.comboProfiles.currentProfileID()
-        if not profile_id:
+        current_profile_id = self.comboProfiles.currentProfileID()
+        if not current_profile_id:
             return
 
-        if profile_id != self.config.currentProfile():
+        if current_profile_id != self.config.currentProfile():
             self.saveProfile()
-            self.config.setCurrentProfile(profile_id)
+            self.config.setCurrentProfile(current_profile_id)
             self.updateProfile()
 
     def updateProfiles(self, reloadSettings=True):
@@ -1211,11 +1212,7 @@ def updateProfiles(self, reloadSettings=True):
 
         self.comboProfiles.clear()
 
-        profiles = self.config.profilesSortedByName()
-        for profile_id in profiles:
-            self.comboProfiles.addProfileID(profile_id)
-            if profile_id == current_profile_id:
-                self.comboProfiles.setCurrentProfileID(profile_id)
+        qttools.update_combo_profiles(self.config, self.comboProfiles, current_profile_id)
 
         self.disableProfileChanged = False
 
diff --git a/qt/test/test_lint.py b/qt/test/test_lint.py
index 2e47c8320..f16013c76 100644
--- a/qt/test/test_lint.py
+++ b/qt/test/test_lint.py
@@ -102,7 +102,7 @@ def test_with_pylint(self):
             # 'R0201',  # no-self-use
             # 'R0202',  # no-classmethod-decorator
             # 'R0203',  # no-staticmethod-decorator
-            # 'R0801',  # duplicate-code
+            'R0801',  # duplicate-code
             # 'W0123',  # eval-used
             # 'W0237',  # arguments-renamed
             # 'W0221',  # arguments-differ