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# -*- coding: utf-8 -*-
from __future__ import division, unicode_literals, print_function, absolute_import
from pint.util import (UnitsContainer)
from pint.converters import (ScaleConverter, OffsetConverter)
from pint.definitions import (Definition, PrefixDefinition, UnitDefinition,
DimensionDefinition)
from pint.testsuite import BaseTestCase
class TestDefinition(BaseTestCase):
def test_invalid(self):
self.assertRaises(ValueError, Definition.from_string, 'x = [time] * meter')
self.assertRaises(ValueError, Definition.from_string, '[x] = [time] * meter')
def test_prefix_definition(self):
for definition in ('m- = 1e-3', 'm- = 10**-3', 'm- = 0.001'):
x = Definition.from_string(definition)
self.assertIsInstance(x, PrefixDefinition)
self.assertEqual(x.name, 'm')
self.assertEqual(x.aliases, ())
self.assertEqual(x.converter.to_reference(1000), 1)
self.assertEqual(x.converter.from_reference(0.001), 1)
self.assertEqual(str(x), 'm')
x = Definition.from_string('kilo- = 1e-3 = k-')
self.assertIsInstance(x, PrefixDefinition)
self.assertEqual(x.name, 'kilo')
self.assertEqual(x.aliases, ())
self.assertEqual(x.symbol, 'k')
self.assertEqual(x.converter.to_reference(1000), 1)
self.assertEqual(x.converter.from_reference(.001), 1)
x = Definition.from_string('kilo- = 1e-3 = k- = anotherk-')
self.assertIsInstance(x, PrefixDefinition)
self.assertEqual(x.name, 'kilo')
self.assertEqual(x.aliases, ('anotherk', ))
self.assertEqual(x.symbol, 'k')
self.assertEqual(x.converter.to_reference(1000), 1)
self.assertEqual(x.converter.from_reference(.001), 1)
def test_baseunit_definition(self):
x = Definition.from_string('meter = [length]')
self.assertIsInstance(x, UnitDefinition)
self.assertTrue(x.is_base)
self.assertEqual(x.reference, UnitsContainer({'[length]': 1}))
def test_unit_definition(self):
x = Definition.from_string('coulomb = ampere * second')
self.assertIsInstance(x, UnitDefinition)
self.assertFalse(x.is_base)
self.assertIsInstance(x.converter, ScaleConverter)
self.assertEqual(x.converter.scale, 1)
self.assertEqual(x.reference, UnitsContainer(ampere=1, second=1))
x = Definition.from_string('faraday = 96485.3399 * coulomb')
self.assertIsInstance(x, UnitDefinition)
self.assertFalse(x.is_base)
self.assertIsInstance(x.converter, ScaleConverter)
self.assertEqual(x.converter.scale, 96485.3399)
self.assertEqual(x.reference, UnitsContainer(coulomb=1))
x = Definition.from_string('degF = 9 / 5 * kelvin; offset: 255.372222')
self.assertIsInstance(x, UnitDefinition)
self.assertFalse(x.is_base)
self.assertIsInstance(x.converter, OffsetConverter)
self.assertEqual(x.converter.scale, 9/5)
self.assertEqual(x.converter.offset, 255.372222)
self.assertEqual(x.reference, UnitsContainer(kelvin=1))
def test_dimension_definition(self):
x = DimensionDefinition('[time]', '', (), converter='')
self.assertTrue(x.is_base)
self.assertEqual(x.name, '[time]')
x = Definition.from_string('[speed] = [length]/[time]')
self.assertIsInstance(x, DimensionDefinition)
self.assertEqual(x.reference, UnitsContainer({'[length]': 1, '[time]': -1}))
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