code: def test_gh_4915(self, xp, scp):
      p = np.roots(np.convolve(np.ones(5), np.ones(5)))
      # true_roots = [-(-1)**(1/5), (-1)**(4/5), -(-1)**(3/5), (-1)**(2/5)]
  
      unique, multiplicity = scp.signal.unique_roots(xp.asarray(p))
      unique = xp.sort(unique)
      return unique, multiplicity
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  import cupyx.scipy.signal
label_desc: Use image node_id 5 for calling the TestUniqueRoots obj's underlying member method code with example usage: obj.test_gh_4915(xp, scp) and returns: unique,  multiplicity