diff --git a/tests/unit/test_logging_securityfilter.py b/tests/unit/test_logging_securityfilter.py
index d73e89bf..7b216680 100644
--- a/tests/unit/test_logging_securityfilter.py
+++ b/tests/unit/test_logging_securityfilter.py
@@ -6,6 +6,7 @@ sensitive information from log messages without causing false positives.
 """
 
 import logging
+
 import pytest
 
 from routstr.core.logging import SecurityFilter
@@ -20,6 +21,7 @@ def security_filter() -> SecurityFilter:
 @pytest.fixture
 def filter_message(security_filter: SecurityFilter):
     """A helper fixture to apply the filter to a message string."""
+
     def _filter(msg: str) -> str:
         record = logging.LogRecord(
             name="test_logger",
@@ -32,6 +34,7 @@ def filter_message(security_filter: SecurityFilter):
         )
         security_filter.filter(record)
         return record.getMessage()
+
     return _filter
 
 
@@ -45,7 +48,7 @@ def test_redacts_unquoted_key_value_pairs(filter_message) -> None:
 def test_redacts_quoted_key_value_pairs(filter_message) -> None:
     """Test that a quoted token is correctly redacted."""
     original = 'User authenticated with token="cashuA123abc"'
-    expected = 'User authenticated with token: [REDACTED]'
+    expected = "User authenticated with token: [REDACTED]"
     assert filter_message(original) == expected
 
 
@@ -109,4 +112,4 @@ def test_is_case_insensitive_for_standalone(filter_message) -> None:
     """Test that standalone matching is case-insensitive."""
     original = "Using NSEC1a8d9f8s7d9f8a7s6d5f4a3s2d1f9a8s7d6f5a4s3d2f1a9s8d7f6a5s4d3f and CaShuA123abc"
     expected = "Using [REDACTED] and [REDACTED]"
-    assert filter_message(original) == expected
\ No newline at end of file
+    assert filter_message(original) == expected