code: def setup_method(self):
      np.random.seed(0)
      n = 1000
      x = np.linspace(0.0, 100, n)
  
      self.sig_zeros = np.zeros(n)
  
      self.sig_off = self.sig_zeros + 100.0
      self.sig_slope = np.linspace(-10.0, 90.0, n)
      self.sig_slope_mean = x - x.mean()
  
      self.sig_base = np.random.standard_normal(n) + np.sin(
          x * 2 * np.pi / (n / 100)
      )
      self.sig_base -= self.sig_base.mean()
  
imports: from numpy.testing import assert_allclose, assert_almost_equal, assert_array_equal, assert_array_almost_equal_nulp
  import numpy
  import pytest
  from matplotlib import mlab
label_desc: Use image node_id 1 for calling the TestDetrend obj's underlying member method code with example usage: obj.setup_method() without return types