code: def test_polycompanion_single_value2(self, xp, dtype):
      a = xp.array([0, 0, 0, 3], 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 15 for calling the TestPolynomial obj's underlying member method code with example usage: obj.test_polycompanion_single_value2(xp, dtype) and returns: xp