def testRoundTo(self, nat, precision, method):
"""
Test proper functioning of Nats.roundTo().
"""
(subject, base) = nat
(result, relation) = Nats.roundTo(subject, base, precision, method)
if precision is None or precision >= 0:
self.assertEqual(result, subject)
self.assertEqual(relation, 0)
return
num_digits = -precision
padding = num_digits * [0]
if result != []:
self.assertEqual(result[precision:], padding)
if num_digits > len(subject):
self.assertIn(result, ([], [1] + padding))
int_subject = Nats.convert_to_int(subject, base)
int_result = Nats.convert_to_int(result, base)
self.assertEqual(
relation,
Fraction(int_result - int_subject, base ** num_digits)
)
self.assertGreater(relation, -1)
self.assertLess(relation, 1)
def testExceptions(self):
""" Test throwing exception. """
with self.assertRaises(BasesError):
Nats.convert_from_int(-32, 2)
with self.assertRaises(BasesError):
Nats.convert_from_int(32, -2)
with self.assertRaises(BasesError):
Nats.convert([1], 1, 2)
with self.assertRaises(BasesError):
Nats.convert([1], 2, 1)
with self.assertRaises(BasesError):
Nats.convert_to_int([1], 1)
with self.assertRaises(BasesError):
Nats.convert_to_int([-1], 2)
with self.assertRaises(BasesError):
Nats.carry_in([-1], 1, 2)
with self.assertRaises(BasesError):
Nats.carry_in([1], -1, 2)
with self.assertRaises(BasesError):
Nats.carry_in([1], 1, 1)
with self.assertRaises(BasesError):
Nats.roundTo([1], 0, 2, RoundingMethods.ROUND_DOWN)
with self.assertRaises(BasesError):
Nats.roundTo([3], 2, 2, RoundingMethods.ROUND_DOWN)
with self.assertRaises(BasesError):
Nats.roundTo([1], 2, 2, None)
