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import pytest
import math
from pint.definitions import Definition
from pint.errors import DefinitionSyntaxError
from pint.facets.nonmultiplicative.definitions import (
LogarithmicConverter,
OffsetConverter,
)
from pint.facets.plain import (
AliasDefinition,
DimensionDefinition,
PrefixDefinition,
ScaleConverter,
UnitDefinition,
)
from pint.util import UnitsContainer
class TestDefinition:
def test_invalid(self):
with pytest.raises(DefinitionSyntaxError):
Definition.from_string("x = [time] * meter")
with pytest.raises(DefinitionSyntaxError):
Definition.from_string("[x] = [time] * meter")
def test_prefix_definition(self):
with pytest.raises(ValueError):
Definition.from_string("m- = 1e-3 k")
for definition in ("m- = 1e-3", "m- = 10**-3", "m- = 0.001"):
x = Definition.from_string(definition)
assert isinstance(x, PrefixDefinition)
assert x.name == "m"
assert x.aliases == ()
assert x.converter.to_reference(1000) == 1
assert x.converter.from_reference(0.001) == 1
x = Definition.from_string("kilo- = 1e-3 = k-")
assert isinstance(x, PrefixDefinition)
assert x.name == "kilo"
assert x.aliases == ()
assert x.symbol == "k"
assert x.converter.to_reference(1000) == 1
assert x.converter.from_reference(0.001) == 1
x = Definition.from_string("kilo- = 1e-3 = k- = anotherk-")
assert isinstance(x, PrefixDefinition)
assert x.name == "kilo"
assert x.aliases == ("anotherk",)
assert x.symbol == "k"
assert x.converter.to_reference(1000) == 1
assert x.converter.from_reference(0.001) == 1
def test_baseunit_definition(self):
x = Definition.from_string("meter = [length]")
assert isinstance(x, UnitDefinition)
assert x.is_base
assert x.reference == UnitsContainer({"[length]": 1})
def test_unit_definition(self):
x = Definition.from_string("coulomb = ampere * second")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, ScaleConverter)
assert x.converter.scale == 1
assert x.reference == UnitsContainer(ampere=1, second=1)
x = Definition.from_string("faraday = 96485.3399 * coulomb")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, ScaleConverter)
assert x.converter.scale == 96485.3399
assert x.reference == UnitsContainer(coulomb=1)
x = Definition.from_string("degF = 9 / 5 * kelvin; offset: 255.372222")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, OffsetConverter)
assert x.converter.scale == 9 / 5
assert x.converter.offset == 255.372222
assert x.reference == UnitsContainer(kelvin=1)
x = Definition.from_string(
f"turn = {math.tau} * radian = _ = revolution = = cycle = _"
)
assert isinstance(x, UnitDefinition)
assert x.name == "turn"
assert x.aliases == ("revolution", "cycle")
assert x.symbol == "turn"
assert not x.is_base
assert isinstance(x.converter, ScaleConverter)
assert x.converter.scale == math.tau
assert x.reference == UnitsContainer(radian=1)
with pytest.raises(ValueError):
Definition.from_string(
"degF = 9 / 5 * kelvin; offset: 255.372222 bla",
)
def test_log_unit_definition(self):
x = Definition.from_string(
"decibelmilliwatt = 1e-3 watt; logbase: 10; logfactor: 10 = dBm"
)
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, LogarithmicConverter)
assert x.converter.scale == 1e-3
assert x.converter.logbase == 10
assert x.converter.logfactor == 10
assert x.reference == UnitsContainer(watt=1)
x = Definition.from_string("decibel = 1 ; logbase: 10; logfactor: 10 = dB")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, LogarithmicConverter)
assert x.converter.scale == 1
assert x.converter.logbase == 10
assert x.converter.logfactor == 10
assert x.reference == UnitsContainer()
x = Definition.from_string("bell = 1 ; logbase: 10; logfactor: 1 = B")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, LogarithmicConverter)
assert x.converter.scale == 1
assert x.converter.logbase == 10
assert x.converter.logfactor == 1
assert x.reference == UnitsContainer()
x = Definition.from_string("decade = 1 ; logbase: 10; logfactor: 1")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, LogarithmicConverter)
assert x.converter.scale == 1
assert x.converter.logbase == 10
assert x.converter.logfactor == 1
assert x.reference == UnitsContainer()
eulersnumber = math.e
x = Definition.from_string(
"neper = 1 ; logbase: %1.50f; logfactor: 0.5 = Np" % eulersnumber
)
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, LogarithmicConverter)
assert x.converter.scale == 1
assert x.converter.logbase == eulersnumber
assert x.converter.logfactor == 0.5
assert x.reference == UnitsContainer()
x = Definition.from_string("octave = 1 ; logbase: 2; logfactor: 1 = oct")
assert isinstance(x, UnitDefinition)
assert not x.is_base
assert isinstance(x.converter, LogarithmicConverter)
assert x.converter.scale == 1
assert x.converter.logbase == 2
assert x.converter.logfactor == 1
assert x.reference == UnitsContainer()
def test_dimension_definition(self):
x = DimensionDefinition("[time]")
assert x.is_base
assert x.name == "[time]"
x = Definition.from_string("[speed] = [length]/[time]")
assert isinstance(x, DimensionDefinition)
assert x.reference == UnitsContainer({"[length]": 1, "[time]": -1})
def test_alias_definition(self):
x = Definition.from_string("@alias meter = metro = metr")
assert isinstance(x, AliasDefinition)
assert x.name == "meter"
assert x.aliases == ("metro", "metr")
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