code: def test_wavelet_std(self):
      np.testing.assert_almost_equal(
          wavelet_std(const0),
          (0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0),
      )
      np.testing.assert_almost_equal(
          wavelet_std(const1),
          (
              0.1767186264889806,
              0.28069306259219023,
              0.3235061868750311,
              0.3115893726751135,
              0.31446140614407014,
              0.3582016825631658,
              0.4133090941627322,
              0.4598585090675407,
              0.4935514064162697,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(constNeg),
          (
              0.1767186264889806,
              0.28069306259219023,
              0.3235061868750311,
              0.3115893726751135,
              0.31446140614407014,
              0.3582016825631658,
              0.4133090941627322,
              0.4598585090675407,
              0.4935514064162697,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(constF),
          (
              0.44179656622245145,
              0.7017326564804757,
              0.8087654671875778,
              0.7789734316877838,
              0.7861535153601755,
              0.8955042064079146,
              1.0332727354068305,
              1.1496462726688517,
              1.2338785160406742,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(lin),
          (
              2.721791561180164,
              5.325234998810811,
              8.137581399111415,
              10.529795250703716,
              11.836525442245224,
              12.296195571788726,
              12.315744378517108,
              12.135259348389042,
              11.869294506387352,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(lin0),
          (
              2.239406940011677,
              4.7878443746478245,
              7.797954379287043,
              10.418506686200207,
              11.746946049852674,
              12.045972295386465,
              11.828477896749822,
              11.408150997410496,
              10.932763618021895,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(wave),
          (
              0.001939366875349316,
              0.009733675496927717,
              0.025635801097107388,
              0.05125305898778544,
              0.08783649118731567,
              0.13636963970273208,
              0.197613166916789,
              0.2721306670702481,
              0.360305525758368,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(offsetWave),
          (
              0.05459142980660159,
              0.10410347082332229,
              0.155831467554863,
              0.2101395066938644,
              0.268489203478025,
              0.33264452641566,
              0.4044076212671741,
              0.4854392072251105,
              0.5771385517659353,
          ),
      )
      np.testing.assert_almost_equal(
          wavelet_std(noiseWave),
          (
              0.08974931069698587,
              0.09625674025798765,
              0.10445386849293256,
              0.11395751571203461,
              0.13232763520967267,
              0.16659967802754122,
              0.2187573594673847,
              0.2877270278501564,
              0.3722670641715661,
          ),
      )
  
imports: import unittest
  import numpy
  from tsfel.feature_extraction.features import *
label_desc: Use image node_id 59 for calling the TestFeatures obj's underlying member method code with example usage: obj.test_wavelet_std() without return types