code: def test_threshold(self):
      # Regression test.  An early version of `pascal` returned an
      # array of type np.uint64 for n=35, but that data type is too small
      # to hold p[-1, -1].  The second assert_equal below would fail
      # because p[-1, -1] overflowed.
      p = pascal(34)
      assert_equal(2 * p.item(-1, -2), p.item(-1, -1), err_msg="n = 34")
      p = pascal(35)
      assert_equal(
          2.0 * p.item(-1, -2), 1.0 * p.item(-1, -1), err_msg="n = 35"
      )
  
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 4 for calling the TestPascal obj's underlying member method code with example usage: obj.test_threshold() without return types