diff --git a/test/conftest.py b/test/conftest.py
index dda8379..cf26b30 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -34,9 +34,9 @@ test_container = 'nginx-proxy-pytest'
 
 
 ###############################################################################
-# 
+#
 # utilities
-# 
+#
 ###############################################################################
 
 @contextlib.contextmanager
@@ -60,7 +60,7 @@ def ipv6(force_ipv6=True):
 
 class requests_for_docker(object):
     """
-    Proxy for calling methods of the requests module. 
+    Proxy for calling methods of the requests module.
     When a HTTP response failed due to HTTP Error 404 or 502, retry a few times.
     Provides method `get_conf` to extract the nginx-proxy configuration content.
     """
@@ -224,7 +224,7 @@ def docker_container_dns_resolver(domain_name):
 
     ip = container_ip(container)
     log.info(f"resolving domain name {domain_name!r} as IP address {ip} of container {container.name}")
-    return ip 
+    return ip
 
 
 def monkey_patch_urllib_dns_resolver():
@@ -306,7 +306,7 @@ def docker_compose_down(compose_file='docker-compose.yml'):
 
 def wait_for_nginxproxy_to_be_ready():
     """
-    If one (and only one) container started from image nginxproxy/nginx-proxy:test is found, 
+    If one (and only one) container started from image nginxproxy/nginx-proxy:test is found,
     wait for its log to contain substring "Watching docker events"
     """
     containers = docker_client.containers.list(filters={"ancestor": "nginxproxy/nginx-proxy:test"})
@@ -416,18 +416,18 @@ def connect_to_all_networks():
 
 
 ###############################################################################
-# 
+#
 # Py.test fixtures
-# 
+#
 ###############################################################################
 
 @pytest.fixture(scope="module")
 def docker_compose(request):
     """
     pytest fixture providing containers described in a docker compose file. After the tests, remove the created containers
-    
+
     A custom docker compose file name can be defined in a variable named `docker_compose_file`.
-    
+
     Also, in the case where pytest is running from a docker container, this fixture makes sure
     our container will be attached to all the docker networks.
     """
@@ -463,9 +463,9 @@ def nginxproxy():
 
 
 ###############################################################################
-# 
+#
 # Py.test hooks
-# 
+#
 ###############################################################################
 
 # pytest hook to display additionnal stuff in test report
@@ -492,9 +492,9 @@ def pytest_runtest_setup(item):
         pytest.xfail(f"previous test failed ({previousfailed.name})")
 
 ###############################################################################
-# 
+#
 # Check requirements
-# 
+#
 ###############################################################################
 
 try: