code: def test_basic(self):
      h3 = array(
          [
              [1.0, 1 / 2.0, 1 / 3.0],
              [1 / 2.0, 1 / 3.0, 1 / 4.0],
              [1 / 3.0, 1 / 4.0, 1 / 5.0],
          ]
      )
      assert_array_almost_equal(hilbert(3), h3)
  
      assert_array_equal(hilbert(1), [[1.0]])
  
      h0 = hilbert(0)
      assert_equal(h0.shape, (0, 0))
  
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 TestHilbert obj's underlying member method code with example usage: obj.test_basic() without return types