diff --git a/requirements.txt b/requirements.txt
index 97aac141..d087648c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 docker
 escapism
 jupyterhub>=1.0
-pytest-jupyterhub @ git+https://github.com/jupyterhub/pytest-jupyterhub.git@main
\ No newline at end of file
+pytest-jupyterhub @ git+https://github.com/jupyterhub/pytest-jupyterhub.git@main
diff --git a/tests/conftest.py b/tests/conftest.py
index 92cf6635..a54104ef 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -8,6 +8,7 @@
 import jupyterhub
 import netifaces
 import pytest
+
 # from pytest_jupyterhub.jupyterhub_spawners import hub_app
 # from pytest_jupyterhub.jupyterhub_spawners import hub_app
 from docker import from_env as docker_from_env
@@ -17,7 +18,6 @@
 
 from dockerspawner import DockerSpawner, SwarmSpawner, SystemUserSpawner
 
-
 # import base jupyterhub fixtures
 
 # make Hub connectable from docker by default
@@ -74,20 +74,16 @@ def app(jupyterhub_app):
         app.config.DockerSpawner.image = f"jupyterhub/singleuser:{tag}"
     return app
  """
- 
+
 
 @pytest.fixture
 async def app(hub_app):
-    config = {
-        "Dockerspawner": {
-            "prefix": "dockerspawner-test"
-        }
-    }
+    config = {"Dockerspawner": {"prefix": "dockerspawner-test"}}
 
     if len(jh_version_info) > 3 and jh_version_info[3]:
         tag = jupyterhub.__version__
         config["Dockerspawner"]["image"] = f"jupyterhub/singleuser:{tag}"
-    
+
     app = await hub_app(config=config)
 
     return app