def testResults(self, s, config):
""" Test component results. """
(m, u) = s.components(config)
self.assertEqual(m * int(u), s.magnitude)
if u == B:
return
if config.unit is None:
if config.binary_units:
self.assertIn(u, BinaryUnits.UNITS())
else:
self.assertIn(u, DecimalUnits.UNITS())
self.assertTrue(abs(m) >= config.min_value)
else:
self.assertEqual(u, config.unit)
(exact, sign, left, right) = get_string_info(
m,
places=config.max_places
)
value = sign * Fraction("%s.%s" % (left, right))
if config.exact_value and config.unit is None:
self.assertTrue(exact)
self.assertTrue(Fraction(value) * int(u) == s.magnitude)
if not exact:
self.assertFalse(Fraction(value) * int(u) == s.magnitude)
def testExactness(self, p, q, n, m):
""" When max_places is not specified and the denominator of
the value is 2^n * 5^m the result is exact.
"""
x = Fraction(p * q, p * (2 ** n * 5 ** m))
(exact, sign, left, right) = get_string_info(x, places=None)
self.assertEqual(sign * Fraction("%s.%s" % (left, right)), x)
self.assertTrue(exact)
def testException(self):
""" Raises exception on bad input. """
with self.assertRaises(SizeValueError):
get_string_info(Decimal(200), places=-1)
with self.assertRaises(SizeValueError):
get_string_info(0.1, places=0)
