code: def test_unsupported_window():
      _ = KPB.get_window_fn("wrong_window_name")
  
file_path: kapre/tests/test_backend.py
imports: import pytest
  import numpy
  import librosa
  import tensorflow
  from tensorflow.keras import backend
  from kapre import backend
  from kapre.backend import magnitude_to_decibel, validate_data_format_str
  from utils import SRC
label_desc: Use image node_id 6 for calling a global function with example usage: test_unsupported_window() without return types