code: def test_polycompanion(self, xp, dtype):
      a = testing.shaped_random((1000,), xp, dtype)
      return xp.polynomial.polynomial.polycompanion(a)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 10 for calling the TestPolynomial obj's underlying member method code with example usage: obj.test_polycompanion(xp, dtype) and returns: xp