extern crate pretty_assertions;

use geo_types::Coord;
use pretty_assertions::assert_eq;

use d3_geo_rs::distance::distance;
use d3_geo_rs::in_delta::in_delta;

#[test]
fn great_arc() {
    println!(
      "geoDistance(a, b) computes the great-arc distance in radians between the two points a and b."
    );
    assert_eq!(
        distance(&Coord { x: 0f64, y: 0f64 }, &Coord { x: 0f64, y: 0f64 }),
        0f64
    );
    assert!(in_delta(
        distance(
            &Coord {
                x: 118f64 + 24f64 / 60f64,
                y: 33f64 + 57f64 / 60f64
            },
            &Coord {
                x: 73f64 + 47f64 / 60f64,
                y: 40f64 + 38f64 / 60f64
            }
        ),
        3974f64 / 6371f64,
        0.5f64
    ));
}

#[test]
fn small_distances() {
    println!("geoDistance(a, b) correctly computes small distances.");
    assert!(
        distance(&Coord { x: 0f64, y: 0f64 }, &Coord { x: 0f64, y: 1e-12 })
            > 0f64
    );
}