code: def test_spectral_kurtosis(self):
      np.testing.assert_almost_equal(
          spectral_kurtosis(const0, Fs), 0.0, decimal=5
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(const1, Fs), 0.0, decimal=5
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(constNeg, Fs), 0.0, decimal=5
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(constF, Fs), 0.0, decimal=5
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(lin, Fs), 4.209140226148914, decimal=0
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(lin0, Fs), 2.378341102603641, decimal=5
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(wave, Fs), 123297212118194.1, decimal=1
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(offsetWave, Fs),
          3.2500028252333513,
          decimal=5,
      )
      np.testing.assert_almost_equal(
          spectral_kurtosis(noiseWave, Fs),
          1.7248024846010621,
          decimal=5,
      )
  
imports: import unittest
  import numpy
  from tsfel.feature_extraction.features import *
label_desc: Use image node_id 43 for calling the TestFeatures obj's underlying member method code with example usage: obj.test_spectral_kurtosis() without return types