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use itertools::Itertools;
use itertools::{put_back, put_back_n};
#[test]
fn peeking_take_while_peekable() {
let mut r = (0..10).peekable();
r.peeking_take_while(|x| *x <= 3).count();
assert_eq!(r.next(), Some(4));
}
#[test]
fn peeking_take_while_put_back() {
let mut r = put_back(0..10);
r.peeking_take_while(|x| *x <= 3).count();
assert_eq!(r.next(), Some(4));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_put_back_n() {
let mut r = put_back_n(6..10);
for elt in (0..6).rev() {
r.put_back(elt);
}
r.peeking_take_while(|x| *x <= 3).count();
assert_eq!(r.next(), Some(4));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_slice_iter() {
let v = [1, 2, 3, 4, 5, 6];
let mut r = v.iter();
r.peeking_take_while(|x| **x <= 3).count();
assert_eq!(r.next(), Some(&4));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}
#[test]
fn peeking_take_while_slice_iter_rev() {
let v = [1, 2, 3, 4, 5, 6];
let mut r = v.iter().rev();
r.peeking_take_while(|x| **x >= 3).count();
assert_eq!(r.next(), Some(&2));
r.peeking_take_while(|_| true).count();
assert_eq!(r.next(), None);
}