code: def test_poly1d_str_and_repr(self):
      p = np.poly1d([1.0, 2, 3])
      assert_equal(repr(p), "poly1d([1., 2., 3.])")
      assert_equal(str(p), "   2\n" "1 x + 2 x + 3")
  
      q = np.poly1d([3.0, 2, 1])
      assert_equal(repr(q), "poly1d([3., 2., 1.])")
      assert_equal(str(q), "   2\n" "3 x + 2 x + 1")
  
      r = np.poly1d([1.89999 + 2j, -3j, -5.12345678, 2 + 1j])
      assert_equal(
          str(r),
          "            3      2\n"
          "(1.9 + 2j) x - 3j x - 5.123 x + (2 + 1j)",
      )
  
      assert_equal(
          str(np.poly1d([-3, -2, -1])), "    2\n" "-3 x - 2 x - 1"
      )
  
imports: import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_almost_equal, assert_array_almost_equal, assert_raises, assert_allclose
  import pytest
label_desc: Use image node_id 1 for calling the TestPolynomial obj's underlying member method code with example usage: obj.test_poly1d_str_and_repr() without return types