def test_shift_monomial_past_end(self): """Test that shifting a Monomial beyond 0 yields 0.""" m1 = Monomial(1, 10) >> 15 m2 = Monomial(1, 10) << -15 m0 = Monomial.zero_instance() self._assert_polynomials_are_the_same(m0, m1) self._assert_polynomials_are_the_same(m0, m2)
def test_zero_instance_mutable(self): """Test that zero instances are mutable.""" zp = Polynomial.zero_instance() zm = Monomial.zero_instance() zc = Constant.zero_instance() zp.a = 1 zm.a = 1 zc.const = 1 self._assert_polynomials_are_the_same(Polynomial(1), zp) self._assert_polynomials_are_the_same(Monomial(1, 0), zm) self._assert_polynomials_are_the_same(Constant(1), zc)