diff --git a/tests/test_charge_point.py b/tests/test_charge_point.py
index 219492e6e..88710e438 100644
--- a/tests/test_charge_point.py
+++ b/tests/test_charge_point.py
@@ -55,7 +55,10 @@ def heartbeat(self, **kwargs):
         ({"evMinV2XEnergyRequest": 200}, {"ev_min_v2x_energy_request": 200}),
         ({"v2xChargingCtrlr": 200}, {"v2x_charging_ctrlr": 200}),
         ({"signV2GCertificate": 200}, {"sign_v2g_certificate": 200}),
-        ({"v2gCertificateInstallationEnabled": 200}, {"v2g_certificate_installation_enabled": 200}),
+        (
+            {"v2gCertificateInstallationEnabled": 200},
+            {"v2g_certificate_installation_enabled": 200},
+        ),
     ],
 )
 def test_camel_to_snake_case(test_input, expected):
@@ -71,7 +74,10 @@ def test_camel_to_snake_case(test_input, expected):
         ({"ev_min_v2x_energy_request": 200}, {"evMinV2XEnergyRequest": 200}),
         ({"v2x_charging_ctrlr": 200}, {"v2xChargingCtrlr": 200}),
         ({"sign_v2g_certificate": 200}, {"signV2GCertificate": 200}),
-        ({"v2g_certificate_installation_enabled": 200}, {"v2gCertificateInstallationEnabled": 200}),
+        (
+            {"v2g_certificate_installation_enabled": 200},
+            {"v2gCertificateInstallationEnabled": 200},
+        ),
     ],
 )
 def test_snake_to_camel_case(test_input, expected):