Fix code formatting in test_history.py

tests/unit/test_history.py

@@ -1,4 +1,5 @@
 """Tests for file history management."""
+
 import tempfile
 from pathlib import Path
 
@@ -80,4 +81,4 @@ def test_clear_history_resets_counter():
         manager.add_history(path, 'new_content')
         entries = manager.cache.get(f'{str(path)}:entries', [])
         assert len(entries) == 1
-        assert entries[0].endswith(':0')  # First key should end with :0
+        assert entries[0].endswith(':0')  # First key should end with :0