use core::iter::Iterator;

use average::{Estimate, Merge, Min};

#[test]
fn trivial() {
    let mut m = Min::new();
    m.add(1.);
    m.add(2.);
    assert_eq!(m.min(), 1.);
    m.add(-1.);
    m.add(1.);
    assert_eq!(m.min(), -1.)
}

#[cfg(feature = "serde1")]
#[test]
fn trivial_serde() {
    let mut m = Min::new();
    m.add(1.);
    m.add(2.);
    m.add(-1.);
    m.add(1.);
    let b = serde_json::to_string(&m).unwrap();
    assert_eq!(&b, "{\"x\":-1.0}");
    let c: Min = serde_json::from_str(&b).unwrap();
    assert_eq!(c.min(), -1.)
}

#[test]
fn merge() {
    let sequence: &[f64] = &[1., 2., 3., 4., 5., 6., 7., 8., 9.];
    for mid in 1..sequence.len() {
        let (left, right) = sequence.split_at(mid);
        let min_total: Min = sequence.iter().collect();
        assert_eq!(min_total.min(), 1.);
        let mut min_left: Min = left.iter().collect();
        assert_eq!(min_left.min(), 1.);
        let min_right: Min = right.iter().collect();
        assert_eq!(min_right.min(), sequence[mid]);
        min_left.merge(&min_right);
        assert_eq!(min_total.min(), min_left.min());
    }
}

#[test]
fn merge_empty() {
    let mut left = Min::new();
    let right = Min::new();
    left.merge(&right);
    assert_eq!(left.min(), f64::INFINITY);
    left.add(1.);
    assert_eq!(left.min(), 1.);
}