diff --git a/plinth/tests/runtests.py b/plinth/tests/runtests.py
index 7a8e8ad91..b33edd70e 100644
--- a/plinth/tests/runtests.py
+++ b/plinth/tests/runtests.py
@@ -33,8 +33,8 @@ def run_tests(pattern=None, return_to_caller=False):
     os.environ['DJANGO_SETTINGS_MODULE'] = \
         'plinth.tests.data.django_test_settings'
     django.setup()
-    TestRunner = get_runner(settings)
-    test_runner = TestRunner()
+    test_runner_cls = get_runner(settings)
+    test_runner = test_runner_cls()
 
     if pattern is None:
         pattern_list = [
@@ -48,5 +48,6 @@ def run_tests(pattern=None, return_to_caller=False):
     if failures > 0 or not return_to_caller:
         sys.exit(bool(failures))
 
+
 if __name__ == '__main__':
     run_tests()
diff --git a/plinth/tests/test_actions.py b/plinth/tests/test_actions.py
index 85b139fb1..8cc46ff46 100644
--- a/plinth/tests/test_actions.py
+++ b/plinth/tests/test_actions.py
@@ -28,8 +28,8 @@ from plinth import cfg
 
 
 test_dir = os.path.split(__file__)[0]
-root_dir = os.path.abspath(os.path.join(test_dir, os.path.pardir + os.path.sep +
-                                        os.path.pardir))
+root_dir = os.path.abspath(os.path.join(test_dir, os.path.pardir +
+                                        os.path.sep + os.path.pardir))
 cfg.actions_dir = os.path.join(root_dir, 'actions')
 
 
@@ -53,7 +53,7 @@ class TestPrivileged(unittest.TestCase):
     def notest_run_as_root(self):
         """1. Privileged actions run as root. """
         self.assertEqual(
-            '0', # user 0 is root
+            '0',  # user 0 is root
             superuser_run('id', ['-ur'])[0].strip())
 
     def test_breakout_actions_dir(self):
@@ -114,7 +114,8 @@ class TestPrivileged(unittest.TestCase):
     def test_breakout_option_list(self):
         """3D. Option lists can't be used to run other actions.
 
-        Verify that shell control characters aren't interpreted in option lists.
+        Verify that shell control characters aren't interpreted in
+        option lists.
         """
         option_lists = ((';', 'echo', 'hello'),
                         ('&&', 'echo', 'hello'),