def test_monomial_can_only_have_one_or_no_terms(self):
"""Test that setting terms works correctly."""
m = Monomial(1, 10)
self.assertRaises(TermError, m.__setattr__, "terms", [(1, 2), (3, 4)])
m = Monomial(1, 10)
m.terms = [(1, 2)]
self._assert_polynomials_are_the_same(Monomial(1, 2), m)
m = Monomial(1, 10)
m.terms = [(0, 2)]
self._assert_polynomials_are_the_same(Monomial(0, 2), m)
def test_monomial_terms(self):
"""Test _vector for Monomials."""
m = Monomial(6, 5)
m.coefficient = 0
self.assertEqual([(0, 0)], m.terms)
m.terms = [(10, 5), (10, 5), (10, 5), (10, 5)]
self.assertEqual(40, m.coefficient)
self.assertEqual(5, m.degree)
m.terms = [(10, 5), (10, 5), (0, 4), (0, 3),
(0, 2), (0, 1), (10, 5), (10, 5)]
self.assertEqual(40, m.coefficient)
self.assertEqual(5, m.degree)
m.terms = [(25, 6), (-25, 6), (25, 4)]
self.assertEqual(25, m.coefficient)
self.assertEqual(4, m.degree)
m.terms = [(25, 6), (-25, 5), (25, 5)]
self.assertEqual(25, m.coefficient)
self.assertEqual(6, m.degree)
bad_terms = [(25, 6), (-25, 6), (25, 4), (25, 3)]
self.assertRaises(TermError, m.__setattr__, "terms", bad_terms)