def test_creation(unit):
"""Verify that a Concentration Type instantiates with the properproperty values from inputs."""
value = random.randint(0, 1000) / 10
instance = ConcentrationType(value, unit)
assert isinstance(instance, ConcentrationType)
assert instance.value == value
assert instance.as_(unit) == pytest.approx(value)
def test_conversion(inVal, inUnit, outVal, outUnit):
"""Verify appropriate conversions between types."""
instance = ConcentrationType(inVal, inUnit)
result = instance.as_(outUnit)
assert result == pytest.approx(outVal)