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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, AliasDefinition) | |
| 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)) | |
| x = Definition.from_string('turn = 6.28 * radian = _ = revolution = = cycle = _') | |
| self.assertIsInstance(x, UnitDefinition) | |
| self.assertEqual(x.name, 'turn') | |
| self.assertEqual(x.aliases, ('revolution', 'cycle')) | |
| self.assertEqual(x.symbol, 'turn') | |
| self.assertFalse(x.is_base) | |
| self.assertIsInstance(x.converter, ScaleConverter) | |
| self.assertEqual(x.converter.scale, 6.28) | |
| self.assertEqual(x.reference, UnitsContainer(radian=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})) | |
| def test_alias_definition(self): | |
| x = Definition.from_string("@alias meter = metro = metr") | |
| self.assertIsInstance(x, AliasDefinition) | |
| self.assertEqual(x.name, "meter") | |
| self.assertEqual(x.aliases, ("metro", "metr")) | |