code: def test_neg(self):
      n = -self.p
      assert_equal(n.symbol, "z")
  
imports: import pytest
  import numpy.polynomial
  from numpy.core import array
  from numpy.testing import assert_equal, assert_raises, assert_
label_desc: Use image node_id 1 for calling the TestUnaryOperators obj's underlying member method code with example usage: obj.test_neg() without return types