conspire 0.6.0

The Rust interface to conspire.
Documentation 
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use crate::{
    EPSILON,
    math::{
        Scalar,
        test::{TestError, assert_eq_from_fd},
    },
    physics::{
        ROOM_TEMPERATURE,
        molecular::single_chain::{Ensemble, IdealChain, Thermodynamics},
    },
};

const NUM: usize = 333;

#[test]
fn finite_difference() -> Result<(), TestError> {
    [
        Ensemble::Isometric(ROOM_TEMPERATURE),
        Ensemble::Isotensional(ROOM_TEMPERATURE),
    ]
    .into_iter()
    .try_for_each(|ensemble| {
        (3..16).into_iter().try_for_each(|number_of_links| {
            let model = IdealChain {
                link_length: 1.0,
                number_of_links,
                ensemble,
            };
            (0..NUM)
                .map(|k| k as Scalar / NUM as Scalar)
                .into_iter()
                .try_for_each(|mut nondimensional_extension| {
                    let mut nondimensional_force =
                        model.nondimensional_force(nondimensional_extension)?;
                    let nondimensional_stiffness =
                        model.nondimensional_stiffness(nondimensional_extension)?;
                    nondimensional_extension += 0.5 * EPSILON;
                    nondimensional_force += 0.5 * EPSILON;
                    let mut finite_difference_1 = model
                        .nondimensional_helmholtz_free_energy_per_link(nondimensional_extension)?;
                    let mut finite_difference_2 =
                        model.nondimensional_force(nondimensional_extension)?;
                    let mut finite_difference_3 =
                        -model.nondimensional_gibbs_free_energy_per_link(nondimensional_force)?;
                    let mut finite_difference_4 =
                        model.nondimensional_extension(nondimensional_force)?;
                    nondimensional_extension -= EPSILON;
                    nondimensional_force -= EPSILON;
                    finite_difference_1 -= model
                        .nondimensional_helmholtz_free_energy_per_link(nondimensional_extension)?;
                    finite_difference_2 -= model.nondimensional_force(nondimensional_extension)?;
                    finite_difference_3 -=
                        -model.nondimensional_gibbs_free_energy_per_link(nondimensional_force)?;
                    finite_difference_4 -= model.nondimensional_extension(nondimensional_force)?;
                    nondimensional_force += 0.5 * EPSILON;
                    let nondimensional_extension =
                        model.nondimensional_extension(nondimensional_force)?;
                    let nondimensional_compliance =
                        model.nondimensional_compliance(nondimensional_force)?;
                    assert_eq_from_fd(&nondimensional_force, &(finite_difference_1 / EPSILON))?;
                    assert_eq_from_fd(&nondimensional_stiffness, &(finite_difference_2 / EPSILON))?;
                    assert_eq_from_fd(&nondimensional_extension, &(finite_difference_3 / EPSILON))?;
                    assert_eq_from_fd(&nondimensional_compliance, &(finite_difference_4 / EPSILON))
                })
        })
    })
}