code: def test_f(fft_mode: FFT_MODE_TYPE, f):
      """Verify the frequency values property `f`."""
      SFT = ShortTimeFFT(
          np.ones(5), hop=4, fs=5, fft_mode=fft_mode, scale_to="psd"
      )
      assert_equal(SFT.f, f)
  
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 16 for calling a global function with example usage: test_f(fft_mode, f) without return types