diff --git a/brian_polling_manager/main.py b/brian_polling_manager/main.py
index 947a37063f4649101ac8a6ac5001314b93172753..5e92a164b9706344ec9d558fd37ed2fd2fdc4473 100644
--- a/brian_polling_manager/main.py
+++ b/brian_polling_manager/main.py
@@ -96,6 +96,7 @@ def refresh(config, force=False):
     jsonschema.validate(result, REFRESH_RESULT_SCHEMA)  # sanity
     return result
 
+
 def _validate_config(_ctx, _param, file):
     """
     loads, validates and returns configuration parameters
diff --git a/test/test_api.py b/test/test_api.py
index c8df1ff2f1efebcd02baad0b4b6bd46d2274afd5..0a647feed8c14f664ae78a5074f68bdd1835a8d1 100644
--- a/test/test_api.py
+++ b/test/test_api.py
@@ -26,6 +26,7 @@ def test_version(client):
     response_data = json.loads(rv.data.decode('utf-8'))
     jsonschema.validate(response_data, VERSION_SCHEMA)
 
+
 @responses.activate
 def test_update(client):
     rv = client.get(
@@ -35,4 +36,3 @@ def test_update(client):
     assert rv.is_json
     response_data = json.loads(rv.data.decode('utf-8'))
     jsonschema.validate(response_data, REFRESH_RESULT_SCHEMA)
-
diff --git a/test/test_e2e.py b/test/test_e2e.py
index ae130cf69a2aafde621a1a858f0413f806e65c62..7486e959f447d984528a2f9e44f9e34b7c79b669 100644
--- a/test/test_e2e.py
+++ b/test/test_e2e.py
@@ -1,6 +1,3 @@
-import json
-import tempfile
-
 from click.testing import CliRunner
 import responses