def test_monomial_coefficient(self):
"""Test that setting a Monomial's coefficient behaves as expected."""
a = Monomial(1, 2)
a.coefficient = 2
expected = Monomial(2, 2)
self._assert_polynomials_are_the_same(expected, a)
b = Monomial(1, 2)
b.coefficient = 0
expected = Monomial(0, 0)
self._assert_polynomials_are_the_same(expected, b)
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)