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from __future__ import annotations
import pytest
from pint import formatting as fmt
from pint.delegates.formatter._format_helpers import formatter, join_u
class TestFormatter:
def test_join(self):
for empty in ((), []):
assert join_u("s", empty) == ""
assert join_u("*", "1 2 3".split()) == "1*2*3"
assert join_u("{0}*{1}", "1 2 3".split()) == "1*2*3"
def test_formatter(self):
assert formatter({}.items(), ()) == ""
assert formatter(dict(meter=1).items(), ()) == "meter"
assert formatter((), dict(meter=-1).items()) == "1 / meter"
assert formatter((), dict(meter=-1).items(), as_ratio=False) == "meter ** -1"
assert (
formatter((), dict(meter=-1, second=-1).items(), as_ratio=False)
== "meter ** -1 * second ** -1"
)
assert (
formatter(
(),
dict(meter=-1, second=-1).items(),
)
== "1 / meter / second"
)
assert (
formatter((), dict(meter=-1, second=-1).items(), single_denominator=True)
== "1 / (meter * second)"
)
assert (
formatter((), dict(meter=-1, second=-2).items())
== "1 / meter / second ** 2"
)
assert (
formatter((), dict(meter=-1, second=-2).items(), single_denominator=True)
== "1 / (meter * second ** 2)"
)
def testparse_spec(self):
assert fmt._parse_spec("") == ""
assert fmt._parse_spec("") == ""
with pytest.raises(ValueError):
fmt._parse_spec("W")
with pytest.raises(ValueError):
fmt._parse_spec("PL")
def test_format_unit(self):
assert fmt.format_unit("", "C") == "dimensionless"
with pytest.raises(ValueError):
fmt.format_unit("m", "W")
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