Add ruff rule for empty line with trailing whitespace.

tests-unit/server/services/file_service_test.py

@@ -20,9 +20,9 @@ def test_list_files_valid_directory(file_service, mock_file_system_ops):
         {"name": "file1.txt", "path": "file1.txt", "type": "file", "size": 100},
         {"name": "dir1", "path": "dir1", "type": "directory"}
     ]
-    
+
     result = file_service.list_files("models")
-    
+
     assert len(result) == 2
     assert result[0]["name"] == "file1.txt"
     assert result[1]["name"] == "dir1"
@@ -35,9 +35,9 @@ def test_list_files_invalid_directory(file_service):
 
 def test_list_files_empty_directory(file_service, mock_file_system_ops):
     mock_file_system_ops.walk_directory.return_value = []
-    
+
     result = file_service.list_files("models")
-    
+
     assert len(result) == 0
     mock_file_system_ops.walk_directory.assert_called_once_with("/path/to/models")
 
@@ -46,9 +46,9 @@ def test_list_files_all_allowed_directories(file_service, mock_file_system_ops,
     mock_file_system_ops.walk_directory.return_value = [
         {"name": f"file_{directory_key}.txt", "path": f"file_{directory_key}.txt", "type": "file", "size": 100}
     ]
-    
+
     result = file_service.list_files(directory_key)
-    
+
     assert len(result) == 1
     assert result[0]["name"] == f"file_{directory_key}.txt"
-    mock_file_system_ops.walk_directory.assert_called_once_with(f"/path/to/{directory_key}")
+    mock_file_system_ops.walk_directory.assert_called_once_with(f"/path/to/{directory_key}")

tests-unit/server/utils/file_operations_test.py

@@ -16,18 +16,18 @@ def temp_directory(tmp_path):
 
 def test_walk_directory(temp_directory):
     result: List[FileSystemItem] = FileSystemOperations.walk_directory(str(temp_directory))
-    
+
     assert len(result) == 5  # 2 directories and 3 files
-    
+
     files = [item for item in result if item['type'] == 'file']
     dirs = [item for item in result if item['type'] == 'directory']
-    
+
     assert len(files) == 3
     assert len(dirs) == 2
-    
+
     file_names = {file['name'] for file in files}
     assert file_names == {'file1.txt', 'file2.txt', 'file3.txt'}
-    
+
     dir_names = {dir['name'] for dir in dirs}
     assert dir_names == {'dir1', 'dir2'}