code: def test_complex_01(self):
      data = (1.0 + arange(3.0)) * (1.0 + 1.0j)
      x = copy(data)
      t = toeplitz(x)
      # Calling toeplitz should not change x.
      assert_array_equal(x, data)
      # According to the docstring, x should be the first column of t.
      col0 = t[:, 0]
      assert_array_equal(col0, data)
      assert_array_equal(t[0, 1:], data[1:].conj())
  
imports: import pytest
  import numpy
  from numpy import arange, array, eye, copy, sqrt
  from numpy.testing import assert_equal, assert_array_equal, assert_array_almost_equal, assert_allclose
  from pytest import raises
  from scipy.fft import fft
  from scipy.special import comb
  from scipy.linalg import toeplitz, hankel, circulant, hadamard, leslie, dft, companion, kron, block_diag, helmert, hilbert, invhilbert, pascal, invpascal, fiedler, fiedler_companion, eigvals, convolution_matrix
  from numpy.linalg import cond
label_desc: Use image node_id 2 for calling the TestToeplitz obj's underlying member method code with example usage: obj.test_complex_01() without return types