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import pytest
from pint import formatting as fmt
class TestFormatter:
def test_join(self):
for empty in ((), []):
assert fmt._join("s", empty) == ""
assert fmt._join("*", "1 2 3".split()) == "1*2*3"
assert fmt._join("{0}*{1}", "1 2 3".split()) == "1*2*3"
def test_formatter(self):
assert fmt.formatter({}.items()) == ""
assert fmt.formatter(dict(meter=1).items()) == "meter"
assert fmt.formatter(dict(meter=-1).items()) == "1 / meter"
assert fmt.formatter(dict(meter=-1).items(), as_ratio=False) == "meter ** -1"
assert (
fmt.formatter(dict(meter=-1, second=-1).items(), as_ratio=False)
== "meter ** -1 * second ** -1"
)
assert fmt.formatter(dict(meter=-1, second=-1).items()) == "1 / meter / second"
assert (
fmt.formatter(dict(meter=-1, second=-1).items(), single_denominator=True)
== "1 / (meter * second)"
)
assert (
fmt.formatter(dict(meter=-1, second=-2).items())
== "1 / meter / second ** 2"
)
assert (
fmt.formatter(dict(meter=-1, second=-2).items(), single_denominator=True)
== "1 / (meter * second ** 2)"
)
def test_parse_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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