code: def test_bad_shapes(self):
      assert_raises(ValueError, companion, [[1, 1], [2, 2]])
      assert_raises(ValueError, companion, [0, 4, 5])
      assert_raises(ValueError, companion, [1])
      assert_raises(ValueError, companion, [])
  
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 1 for calling the TestCompanion obj's underlying member method code with example usage: obj.test_bad_shapes() without return types