uom 0.38.0

Units of measurement
Documentation 
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//! Magnetic permeability (base unit henry per meter, m · kg · s⁻² · A⁻²).

quantity! {
    /// Magnetic permeability (base unit henry per meter, m · kg · s⁻² · A⁻²).
    quantity: MagneticPermeability; "magnetic permeability";
    /// Dimension of magnetic permeability, LMT⁻²I⁻² (base unit henry per meter,
    /// m · kg · s⁻² · A⁻²).
    dimension: ISQ<
        P1,     // length
        P1,     // mass
        N2,     // time
        N2,     // electric current
        Z0,     // thermodynamic temperature
        Z0,     // amount of substance
        Z0>;    // luminous intensity
    units {
        @henry_per_meter: prefix!(none); "H/m", "henry per meter", "henrys per meter";
        @vacuum_magnetic_permeability: 1.256_637_062_12_E-6; "µ₀", "vacuum magnetic permeability",
            "vacuum magnetic permeability";
    }
}

#[cfg(test)]
mod tests {
    storage_types! {
        use crate::num::One;
        use crate::si::inductance as ind;
        use crate::si::magnetic_permeability as mp;
        use crate::si::length as l;
        use crate::si::quantities::*;
        use crate::tests::Test;

        #[test]
        fn check_dimension() {
            let _: MagneticPermeability<V> = Inductance::new::<ind::henry>(V::one())
                / Length::new::<l::meter>(V::one());
        }

        #[test]
        fn check_units() {
            test::<mp::henry_per_meter, ind::henry, l::meter>();

            fn test<MP: mp::Conversion<V>, IND: ind::Conversion<V>, L: l::Conversion<V>>() {
                Test::assert_approx_eq(&MagneticPermeability::new::<MP>(V::one()),
                    &(Inductance::new::<IND>(V::one())
                        / Length::new::<L>(V::one())));
            }
        }
    }
}