code: def test_autocorr(self):
      np.testing.assert_almost_equal(autocorr(const0), 0.0)
      np.testing.assert_almost_equal(autocorr(const1), 20.0)
      np.testing.assert_almost_equal(autocorr(constNeg), 20.0)
      np.testing.assert_almost_equal(autocorr(constF), 125.0)
      np.testing.assert_almost_equal(autocorr(lin), 2470.0)
      np.testing.assert_almost_equal(
          autocorr(lin0), 736.8421052631579, decimal=0
      )
      np.testing.assert_almost_equal(autocorr(wave), 500.5, decimal=0)
      np.testing.assert_almost_equal(
          autocorr(offsetWave), 4500.0, decimal=0
      )
      np.testing.assert_almost_equal(
          autocorr(noiseWave), 508.6149018530489, decimal=0
      )
  
imports: import unittest
  import numpy
  from tsfel.feature_extraction.features import *
label_desc: Use image node_id 28 for calling the TestFeatures obj's underlying member method code with example usage: obj.test_autocorr() without return types