diff --git a/.drone.yml b/.drone.yml
index 0f30dc5..24142c8 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -14,3 +14,6 @@ steps:
 - name: bandit
   commands:
   - bandit -ll -r selfprivacy_api
+- name: formatting
+  commands:
+  - black --check .
\ No newline at end of file
diff --git a/tests/conftest.py b/tests/conftest.py
index 93f1e04..aab30dd 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -31,6 +31,7 @@ class AuthorizedClient(testing.FlaskClient):
         kwargs["headers"]["Authorization"] = f"Bearer {self.token}"
         return super().open(*args, **kwargs)
 
+
 class WrongAuthClient(testing.FlaskClient):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -42,16 +43,19 @@ class WrongAuthClient(testing.FlaskClient):
         kwargs["headers"]["Authorization"] = f"Bearer {self.token}"
         return super().open(*args, **kwargs)
 
+
 @pytest.fixture
 def authorized_client(app):
     app.test_client_class = AuthorizedClient
     return app.test_client()
 
+
 @pytest.fixture
 def wrong_auth_client(app):
     app.test_client_class = WrongAuthClient
     return app.test_client()
 
+
 @pytest.fixture
 def runner(app):
     return app.test_cli_runner()
diff --git a/tests/test_system.py b/tests/test_system.py
index 33aed6f..e7cfb0b 100644
--- a/tests/test_system.py
+++ b/tests/test_system.py
@@ -4,14 +4,17 @@ import json
 import pytest
 from selfprivacy_api.utils import get_domain
 
+
 @pytest.fixture
 def domain_file(mocker, datadir):
     mocker.patch("selfprivacy_api.utils.DOMAIN_FILE", datadir / "domain")
     return datadir
 
+
 def test_wrong_auth(wrong_auth_client):
     response = wrong_auth_client.get("/system/pythonVersion")
     assert response.status_code == 401
 
+
 def test_get_domain(authorized_client, domain_file):
     assert get_domain() == "test-domain.tld"