code: def test_roots(self):
      assert_array_equal(np.roots([1, 0, 0]), [0, 0])
  
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 7 for calling the TestPolynomial obj's underlying member method code with example usage: obj.test_roots() without return types