// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use core::result::Result::{Ok, Err};

#[test]
fn binary_search_not_found() {
    let b = [1, 2, 4, 6, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&6)) == Ok(3));
    let b = [1, 2, 4, 6, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&5)) == Err(3));
    let b = [1, 2, 4, 6, 7, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&6)) == Ok(3));
    let b = [1, 2, 4, 6, 7, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&5)) == Err(3));
    let b = [1, 2, 4, 6, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&8)) == Ok(4));
    let b = [1, 2, 4, 6, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&7)) == Err(4));
    let b = [1, 2, 4, 6, 7, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&8)) == Ok(5));
    let b = [1, 2, 4, 5, 6, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&7)) == Err(5));
    let b = [1, 2, 4, 5, 6, 8, 9];
    assert!(b.binary_search_by(|v| v.cmp(&0)) == Err(0));
    let b = [1, 2, 4, 5, 6, 8];
    assert!(b.binary_search_by(|v| v.cmp(&9)) == Err(6));
}

#[test]
fn test_iterator_nth() {
    let v: &[_] = &[0, 1, 2, 3, 4];
    for i in 0..v.len() {
        assert_eq!(v.iter().nth(i).unwrap(), &v[i]);
    }
    assert_eq!(v.iter().nth(v.len()), None);

    let mut iter = v.iter();
    assert_eq!(iter.nth(2).unwrap(), &v[2]);
    assert_eq!(iter.nth(1).unwrap(), &v[4]);
}

#[test]
fn test_iterator_last() {
    let v: &[_] = &[0, 1, 2, 3, 4];
    assert_eq!(v.iter().last().unwrap(), &4);
    assert_eq!(v[..1].iter().last().unwrap(), &0);
}

#[test]
fn test_iterator_count() {
    let v: &[_] = &[0, 1, 2, 3, 4];
    assert_eq!(v.iter().count(), 5);

    let mut iter2 = v.iter();
    iter2.next();
    iter2.next();
    assert_eq!(iter2.count(), 3);
}

#[test]
fn test_chunks_count() {
    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
    let c = v.chunks(3);
    assert_eq!(c.count(), 2);

    let v2: &[i32] = &[0, 1, 2, 3, 4];
    let c2 = v2.chunks(2);
    assert_eq!(c2.count(), 3);

    let v3: &[i32] = &[];
    let c3 = v3.chunks(2);
    assert_eq!(c3.count(), 0);
}

#[test]
fn test_chunks_nth() {
    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
    let mut c = v.chunks(2);
    assert_eq!(c.nth(1).unwrap()[1], 3);
    assert_eq!(c.next().unwrap()[0], 4);

    let v2: &[i32] = &[0, 1, 2, 3, 4];
    let mut c2 = v2.chunks(3);
    assert_eq!(c2.nth(1).unwrap()[1], 4);
    assert_eq!(c2.next(), None);
}

#[test]
fn test_chunks_last() {
    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
    let c = v.chunks(2);
    assert_eq!(c.last().unwrap()[1], 5);

    let v2: &[i32] = &[0, 1, 2, 3, 4];
    let c2 = v2.chunks(2);
    assert_eq!(c2.last().unwrap()[0], 4);
}

#[test]
fn test_chunks_mut_count() {
    let mut v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
    let c = v.chunks_mut(3);
    assert_eq!(c.count(), 2);

    let mut v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
    let c2 = v2.chunks_mut(2);
    assert_eq!(c2.count(), 3);

    let mut v3: &mut [i32] = &mut [];
    let c3 = v3.chunks_mut(2);
    assert_eq!(c3.count(), 0);
}

#[test]
fn test_chunks_mut_nth() {
    let mut v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
    let mut c = v.chunks_mut(2);
    assert_eq!(c.nth(1).unwrap()[1], 3);
    assert_eq!(c.next().unwrap()[0], 4);

    let mut v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
    let mut c2 = v2.chunks_mut(3);
    assert_eq!(c2.nth(1).unwrap()[1], 4);
    assert_eq!(c2.next(), None);
}

#[test]
fn test_chunks_mut_last() {
    let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
    let c = v.chunks_mut(2);
    assert_eq!(c.last().unwrap()[1], 5);

    let v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
    let c2 = v2.chunks_mut(2);
    assert_eq!(c2.last().unwrap()[0], 4);
}


#[test]
fn test_windows_count() {
    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
    let c = v.windows(3);
    assert_eq!(c.count(), 4);

    let v2: &[i32] = &[0, 1, 2, 3, 4];
    let c2 = v2.windows(6);
    assert_eq!(c2.count(), 0);

    let v3: &[i32] = &[];
    let c3 = v3.windows(2);
    assert_eq!(c3.count(), 0);
}

#[test]
fn test_windows_nth() {
    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
    let mut c = v.windows(2);
    assert_eq!(c.nth(2).unwrap()[1], 3);
    assert_eq!(c.next().unwrap()[0], 3);

    let v2: &[i32] = &[0, 1, 2, 3, 4];
    let mut c2 = v2.windows(4);
    assert_eq!(c2.nth(1).unwrap()[1], 2);
    assert_eq!(c2.next(), None);
}

#[test]
fn test_windows_last() {
    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
    let c = v.windows(2);
    assert_eq!(c.last().unwrap()[1], 5);

    let v2: &[i32] = &[0, 1, 2, 3, 4];
    let c2 = v2.windows(2);
    assert_eq!(c2.last().unwrap()[0], 3);
}