diff --git a/Makefile b/Makefile
index e6aed882..72a264b1 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@ format:
 
 check-format:
 	isort --recursive --atomic --check-only panos
-	black --check .
+	black --check --diff .
 
 test:
 	pytest
diff --git a/tests/test_base.py b/tests/test_base.py
index 422eb0a4..9429d7d1 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -1624,13 +1624,15 @@ class TestIsReady(unittest.TestCase):
     @mock.patch("time.sleep")
     def test_ok(self, mocksleep):
         fw = Base.PanDevice("127.0.0.1", "admin", "secret", api_key="apikey")
-        fw.xapi.op = mock.Mock(side_effect=[
-            Err.PanURLError,
-            pan.xapi.PanXapiError,
-            Err.PanXapiError,
-            ET.fromstring("<response><result>yes</result></response>"),
-            ValueError,
-        ])
+        fw.xapi.op = mock.Mock(
+            side_effect=[
+                Err.PanURLError,
+                pan.xapi.PanXapiError,
+                Err.PanXapiError,
+                ET.fromstring("<response><result>yes</result></response>"),
+                ValueError,
+            ],
+        )
 
         ans = fw.is_ready()
 
@@ -1640,10 +1642,12 @@ def test_ok(self, mocksleep):
     @mock.patch("time.sleep")
     def test_times_out(self, mocksleep):
         fw = Base.PanDevice("127.0.0.1", "admin", "secret", api_key="apikey")
-        fw.xapi.op = mock.Mock(side_effect=[
-            Err.PanURLError,
-            ValueError,
-        ])
+        fw.xapi.op = mock.Mock(
+            side_effect=[
+                Err.PanURLError,
+                ValueError,
+            ],
+        )
 
         ans = fw.is_ready(seconds=0)