src/libcoretest/slice.rs

// 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);
}