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test_unitconv.py
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test_unitconv.py
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from __future__ import division
import doctest
import unittest
import unitconv
def test_unitconv():
# this would be lots better if we could just use py.test --doctest-modules,
# but a bunch of other code has things that look like doctests and fail,
# and more code which isn't protected by __name__ == "__main__" checks, and
# py.test won't let us pick and choose modules for doctesting.
#
# or if we could use doctest.DocTestSuite(), that'd be nice, but that
# would require py.test 2.3 to work, and i worry about adding dependencies
# on things as new as that.
doctest.testmod(unitconv)
class TestParseUnitname(unittest.TestCase):
def test_non_fractional(self):
self.assertDictEqual(
unitconv.parse_unitname('Kimo'),
{'multiplier': 1024 * 60 * 60 * 24 * 30, 'unit_class': 'time',
'primary_unit': 's', 'base_unit': 'mo',
'numer_multiplier': 1024 * 60 * 60 * 24 * 30, 'numer_unit_class': 'time',
'numer_primary_unit': 's', 'numer_base_unit': 'mo'})
def test_fractional(self):
self.assertDictEqual(
unitconv.parse_unitname('GB/h'),
{'numer_multiplier': 1e9 * 8, 'denom_multiplier': 3600,
'multiplier': 1e9 * 8 / 3600,
'numer_unit_class': 'datasize', 'denom_unit_class': 'time',
'unit_class': 'datasize/time',
'numer_primary_unit': 'b', 'denom_primary_unit': 's',
'primary_unit': 'b/s',
'numer_base_unit': 'B', 'denom_base_unit': 'h',
'base_unit': 'B/h'})
self.assertDictEqual(
unitconv.parse_unitname('kb/k', fold_scale_prefix=False),
{'numer_multiplier': 1, 'denom_multiplier': 1,
'multiplier': 1,
'numer_scale_multiplier': 1000, 'denom_scale_multiplier': 1,
'scale_multiplier': 1000,
'numer_unit_class': 'datasize', 'denom_unit_class': None,
'unit_class': None,
'numer_primary_unit': 'b', 'denom_primary_unit': 'k',
'primary_unit': 'b/k',
'numer_base_unit': 'b', 'denom_base_unit': 'k',
'base_unit': 'b/k'})
self.assertDictEqual(
unitconv.parse_unitname('Foobity/w', fold_scale_prefix=False),
{'numer_multiplier': 1, 'denom_multiplier': 86400 * 7,
'multiplier': 1 / (86400 * 7),
'numer_scale_multiplier': 1, 'denom_scale_multiplier': 1,
'scale_multiplier': 1,
'numer_unit_class': None, 'denom_unit_class': 'time',
'unit_class': None,
'numer_primary_unit': 'Foobity', 'denom_primary_unit': 's',
'primary_unit': 'Foobity/s',
'numer_base_unit': 'Foobity', 'denom_base_unit': 'w',
'base_unit': 'Foobity/w'})
def test_unparseable(self):
self.assertDictEqual(
unitconv.parse_unitname('/w'),
{'multiplier': 1, 'unit_class': None, 'primary_unit': '/w',
'base_unit': '/w'})
self.assertDictEqual(
unitconv.parse_unitname('/'),
{'multiplier': 1, 'unit_class': None, 'primary_unit': '/',
'base_unit': '/'})
self.assertDictEqual(
unitconv.parse_unitname('a/b/c'),
{'multiplier': 1, 'unit_class': None, 'primary_unit': 'a/b/c',
'base_unit': 'a/b/c'})
self.assertDictEqual(
unitconv.parse_unitname(''),
{'multiplier': 1, 'unit_class': None, 'primary_unit': '',
'base_unit': ''})
def run_scenario(user_asked_for, data_exists_as, allow_derivation=True,
allow_integration=False, allow_prefixes_in_denominator=False,
round_result=6):
userunit = unitconv.parse_unitname(user_asked_for, fold_scale_prefix=False)
prefixclass = unitconv.prefix_class_for(userunit['scale_multiplier'])
use_unit = userunit['base_unit']
compatibles = unitconv.determine_compatible_units(
allow_derivation=allow_derivation,
allow_integration=allow_integration,
allow_prefixes_in_denominator=allow_prefixes_in_denominator,
**userunit)
try:
scale, extra_op = compatibles[data_exists_as]
except KeyError:
return
if round_result is not None:
scale = round(scale, round_result)
return (data_exists_as, use_unit, scale, extra_op, prefixclass)
class TestDetermineCompatible(unittest.TestCase):
def test_compatible_to_simple_primary_type(self):
all_time_units = [pair[0] for pair in unitconv.unit_classes_by_name['time']]
u = unitconv.determine_compatible_units('s', 'time')
compatunits = u.keys()
for timeunit in all_time_units:
self.assertIn(timeunit, compatunits)
self.assertEqual(u['MM'], (60000000.0, None))
self.assertEqual(u['h'], (3600.0, None))
self.assertEqual([extra_op for (_multiplier, extra_op) in u.values()],
[None] * len(u))
def test_allow_derivation(self):
u = unitconv.determine_compatible_units('b', 'datasize', 1, 's', 'time')
self.assertEqual(u['b'], (1.0, 'derive'))
self.assertEqual(u['B'], (8.0, 'derive'))
self.assertEqual(u['b/s'], (1.0, None))
self.assertAlmostEqual(u['B/d'][0], 9.26e-05)
self.assertIsNone(u['B/d'][1])
self.assertNotIn('h', u)
def test_allow_integration(self):
u = unitconv.determine_compatible_units('Eggnog', None, 0.125, allow_integration=True)
self.assertEqual(u['Eggnog'], (8.0, None))
self.assertAlmostEqual(u['Eggnog/h'][0], 0.0022222)
self.assertEqual(u['Eggnog/h'][1], 'integrate')
self.assertNotIn('derive', [extra_op for (_multiplier, extra_op) in u.values()])
class TestUnitconv(unittest.TestCase):
# in the comments explaining results, X(t) represents a data series in
# graphite with the "data_exists_as" unit, and Y(t) represents the data
# series we want to graph, in the "user_asked_for" unit. the results of
# run_scenario should give the necessary steps to convert X(t) to Y(t).
def test_straightforward_conversion(self):
self.assertEqual(run_scenario(user_asked_for='B', data_exists_as='b'),
('b', 'B', 0.125, None, 'si'))
# 0.125 * X(t) b = Y(t) B
def test_esoteric_conversion_with_derive(self):
self.assertEqual(run_scenario(user_asked_for='MiB/d', data_exists_as='kb'),
('kb', 'B/d', 10800000, 'derive', 'binary'))
# d(X(t) kb)/dt kb/s * 86400 s/d * 1B/8b * 1000 B/kB = Y(t) B/d
# 86400 * 1000 / 8 = 10800000
def test_unrecognized_unit_derive(self):
self.assertEqual(run_scenario(user_asked_for='Cheese/w', data_exists_as='Cheese'),
('Cheese', 'Cheese/w', 604800.0, 'derive', 'si'))
# d(604800.0 * X(t) Cheese)/dt = Y(t) Cheese/w
def test_integration(self):
self.assertEqual(run_scenario(user_asked_for='b', data_exists_as='MB/s',
allow_integration=True),
('MB/s', 'b', 8000000.0, 'integrate', 'si'))
# Integral(8000000.0 * X(t) MB/s, dt) = Y(t) b
def test_conversion_between_unrecognized_units(self):
self.assertIsNone(run_scenario(user_asked_for='pony', data_exists_as='coal'))
# can't convert
def test_conversion_between_units_of_different_class(self):
self.assertIsNone(run_scenario(user_asked_for='d', data_exists_as='Mb'))
# we know what they are but we can't convert days to megabits
def test_straightforward_conversion_with_compound_units(self):
self.assertEqual(run_scenario(user_asked_for='kb/s', data_exists_as='TiB/w'),
('TiB/w', 'b/s', 14543804.600212, None, 'si'))
# X(t) TiB/w * (1024**4 B/TiB) * (8 b/B) * (1 w/604800 s) = Y(t) kb/s
# 1024**4 * 8 / 604800 =~ 14543804.600212
def test_straightforward_conversion_between_iec_data_rates(self):
self.assertEqual(run_scenario(user_asked_for='KiB', data_exists_as='TiB/w',
allow_integration=True),
('TiB/w', 'B', 1817975.575026, 'integrate', 'binary'))
# X(t) TiB/w * (1024**4 B/TiB) * (1 w/604800 s) = Z(t) B/s
# Integral(Z(t) KiB/s, dt) = Y(t) KiB