code: def test_invertible():
      """Verify `invertible` property."""
      SFT = ShortTimeFFT(np.ones(8), hop=4, fs=1)
      assert SFT.invertible
      SFT = ShortTimeFFT(np.ones(8), hop=9, fs=1)
      assert not SFT.invertible
  
imports: import math
  from itertools import product
  from typing import cast, get_args, Literal
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_equal
  from scipy.fft import fftshift
  from scipy.stats import norm
  from scipy.signal import get_window, welch, stft, istft, spectrogram
  from scipy.signal._short_time_fft import FFT_MODE_TYPE, _calc_dual_canonical_window, ShortTimeFFT, PAD_TYPE
  from scipy.signal.windows import gaussian
label_desc: Use image node_id 12 for calling a global function with example usage: test_invertible() without return types