diff --git a/tests/slack_sdk/oauth/installation_store/test_internals.py b/tests/slack_sdk/oauth/installation_store/test_internals.py
index 948aa8c1..8c73b4c6 100644
--- a/tests/slack_sdk/oauth/installation_store/test_internals.py
+++ b/tests/slack_sdk/oauth/installation_store/test_internals.py
@@ -20,16 +20,19 @@ def test_iso_format(self):
         self.assertEqual(dt.timestamp(), 1626249617.0)
 
 
-@pytest.mark.parametrize('ts,target_type,expected_result', [
-    (1701209097, int, 1701209097),
-    (datetime(2023, 11, 28, 22, 9, 7, tzinfo=timezone.utc), int, 1701209347),
-    ("1701209605", int, 1701209605),
-    ("2023-11-28 22:11:19", int, 1701209479),
-    (1701209998.3429494, float, 1701209998.3429494),
-    (datetime(2023, 11, 28, 22, 20, 25, 262571, tzinfo=timezone.utc), float, 1701210025.262571),
-    ("1701210054.4672053", float, 1701210054.4672053),
-    ("2023-11-28 22:21:14.745556", float, 1701210074.745556),
-])
+@pytest.mark.parametrize(
+    "ts,target_type,expected_result",
+    [
+        (1701209097, int, 1701209097),
+        (datetime(2023, 11, 28, 22, 9, 7, tzinfo=timezone.utc), int, 1701209347),
+        ("1701209605", int, 1701209605),
+        ("2023-11-28 22:11:19", int, 1701209479),
+        (1701209998.3429494, float, 1701209998.3429494),
+        (datetime(2023, 11, 28, 22, 20, 25, 262571, tzinfo=timezone.utc), float, 1701210025.262571),
+        ("1701210054.4672053", float, 1701210054.4672053),
+        ("2023-11-28 22:21:14.745556", float, 1701210074.745556),
+    ],
+)
 def test_timestamp_to_type(ts, target_type, expected_result):
     result = _timestamp_to_type(ts, target_type)
     assert result == expected_result
@@ -38,7 +41,7 @@ def test_timestamp_to_type(ts, target_type, expected_result):
 def test_timestamp_to_type_invalid_str():
     match = "Invalid isoformat string" if sys.version_info[:2] > (3, 6) else "time data .* does not match format"
     with pytest.raises(ValueError, match=match):
-        _timestamp_to_type('not-a-timestamp', int)
+        _timestamp_to_type("not-a-timestamp", int)
 
 
 def test_timestamp_to_type_unsupported_format():