def testRoundingExceptions(self):
"""
Test exceptions.
"""
# pylint: disable=pointless-statement
with self.assertRaises(BasesError):
Rationals.round_to_int(Fraction(1, 2), None)
def test_rounding_exceptions(self):
"""
Test exceptions.
"""
# pylint: disable=pointless-statement
with self.assertRaises(BasesError):
Rationals.round_to_int(Fraction(1, 2), None)
def test_as_int(self, radix, method):
"""
Test equivalence with two paths.
"""
result1 = Rationals.round_to_int(radix.as_rational(), method)
result2 = radix.as_int(method)
self.assertEqual(result1, result2)
def testAsInt(self, radix, method):
"""
Test equivalence with two paths.
"""
result1 = Rationals.round_to_int(radix.as_rational(), method)
result2 = radix.as_int(method)
assert result1 == result2
def test_rounding(self, value, method):
"""
Test rounding to int.
"""
(result, _) = Rationals.round_to_int(value, method)
self.assertIsInstance(result, int)
(lower, upper) = (result - 1, result + 1)
self.assertTrue((lower <= value <= result)
or (result <= value <= upper))
def testRounding(self, value, method):
"""
Test rounding to int.
"""
(result, _) = Rationals.round_to_int(value, method)
self.assertIsInstance(result, six.integer_types)
(lower, upper) = (result - 1, result + 1)
self.assertTrue(
(lower <= value and value <= result) or \
(result <= value and value <= upper)
)
def testRoundingPrecise(self, numerator):
"""
Test with predicted value.
"""
# pylint: disable=too-many-statements
value = Fraction(numerator, 10)
(result, rel) = \
Rationals.round_to_int(value, RoundingMethods.ROUND_DOWN)
self.assertEqual(result, 0)
self.assertEqual(rel, -value)
(result, rel) = \
Rationals.round_to_int(-value, RoundingMethods.ROUND_DOWN)
self.assertEqual(result, -1)
self.assertEqual(rel, value - 1)
(result, rel) = \
Rationals.round_to_int(value, RoundingMethods.ROUND_UP)
self.assertEqual(result, 1)
self.assertEqual(rel, 1 - value)
(result, rel) = \
Rationals.round_to_int(-value, RoundingMethods.ROUND_UP)
self.assertEqual(result, 0)
self.assertEqual(rel, value)
(result, rel) = \
Rationals.round_to_int(value, RoundingMethods.ROUND_TO_ZERO)
self.assertEqual(result, 0)
self.assertEqual(rel, -value)
(result, rel) = \
Rationals.round_to_int(-value, RoundingMethods.ROUND_TO_ZERO)
self.assertEqual(result, 0)
self.assertEqual(rel, value)
(result, rel) = \
Rationals.round_to_int(value, RoundingMethods.ROUND_HALF_UP)
if numerator < 5:
self.assertEqual(result, 0)
self.assertEqual(rel, -value)
else:
self.assertEqual(result, 1)
self.assertEqual(rel, 1 - value)
(result, rel) = \
Rationals.round_to_int(-value, RoundingMethods.ROUND_HALF_UP)
if numerator <= 5:
self.assertEqual(result, 0)
self.assertEqual(rel, value)
else:
self.assertEqual(result, -1)
self.assertEqual(rel, value - 1)
(result, rel) = \
Rationals.round_to_int(value, RoundingMethods.ROUND_HALF_DOWN)
if numerator > 5:
self.assertEqual(result, 1)
self.assertEqual(rel, 1 - value)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, -value)
(result, rel) = \
Rationals.round_to_int(-value, RoundingMethods.ROUND_HALF_DOWN)
if numerator >= 5:
self.assertEqual(result, -1)
self.assertEqual(rel, value - 1)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, value)
(result, rel) = \
Rationals.round_to_int(value, RoundingMethods.ROUND_HALF_ZERO)
if numerator > 5:
self.assertEqual(result, 1)
self.assertEqual(rel, 1 - value)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, -value)
(result, rel) = \
Rationals.round_to_int(-value, RoundingMethods.ROUND_HALF_ZERO)
if numerator > 5:
self.assertEqual(result, -1)
self.assertEqual(rel, value - 1)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, value)
def test_rounding_precise(self, numerator):
"""
Test with predicted value.
"""
# pylint: disable=too-many-statements
value = Fraction(numerator, 10)
(result, rel) = Rationals.round_to_int(value,
RoundingMethods.ROUND_DOWN)
self.assertEqual(result, 0)
self.assertEqual(rel, -1)
(result, rel) = Rationals.round_to_int(-value,
RoundingMethods.ROUND_DOWN)
self.assertEqual(result, -1)
self.assertEqual(rel, -1)
(result, rel) = Rationals.round_to_int(value, RoundingMethods.ROUND_UP)
self.assertEqual(result, 1)
self.assertEqual(rel, 1)
(result, rel) = Rationals.round_to_int(-value,
RoundingMethods.ROUND_UP)
self.assertEqual(result, 0)
self.assertEqual(rel, 1)
(result, rel) = Rationals.round_to_int(value,
RoundingMethods.ROUND_TO_ZERO)
self.assertEqual(result, 0)
self.assertEqual(rel, -1)
(result, rel) = Rationals.round_to_int(-value,
RoundingMethods.ROUND_TO_ZERO)
self.assertEqual(result, 0)
self.assertEqual(rel, 1)
(result, rel) = Rationals.round_to_int(value,
RoundingMethods.ROUND_HALF_UP)
if numerator < 5:
self.assertEqual(result, 0)
self.assertEqual(rel, -1)
else:
self.assertEqual(result, 1)
self.assertEqual(rel, 1)
(result, rel) = Rationals.round_to_int(-value,
RoundingMethods.ROUND_HALF_UP)
if numerator <= 5:
self.assertEqual(result, 0)
self.assertEqual(rel, 1)
else:
self.assertEqual(result, -1)
self.assertEqual(rel, -1)
(result, rel) = Rationals.round_to_int(value,
RoundingMethods.ROUND_HALF_DOWN)
if numerator > 5:
self.assertEqual(result, 1)
self.assertEqual(rel, 1)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, -1)
(result, rel) = Rationals.round_to_int(-value,
RoundingMethods.ROUND_HALF_DOWN)
if numerator >= 5:
self.assertEqual(result, -1)
self.assertEqual(rel, -1)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, 1)
(result, rel) = Rationals.round_to_int(value,
RoundingMethods.ROUND_HALF_ZERO)
if numerator > 5:
self.assertEqual(result, 1)
self.assertEqual(rel, 1)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, -1)
(result, rel) = Rationals.round_to_int(-value,
RoundingMethods.ROUND_HALF_ZERO)
if numerator > 5:
self.assertEqual(result, -1)
self.assertEqual(rel, -1)
else:
self.assertEqual(result, 0)
self.assertEqual(rel, 1)
