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use itertools::Itertools;
#[test]
fn tuples() {
let v = [1, 2, 3, 4, 5];
let mut iter = v.iter().cloned().tuples();
assert_eq!(Some((1,)), iter.next());
assert_eq!(Some((2,)), iter.next());
assert_eq!(Some((3,)), iter.next());
assert_eq!(Some((4,)), iter.next());
assert_eq!(Some((5,)), iter.next());
assert_eq!(None, iter.next());
assert_eq!(None, iter.into_buffer().next());
let mut iter = v.iter().cloned().tuples();
assert_eq!(Some((1, 2)), iter.next());
assert_eq!(Some((3, 4)), iter.next());
assert_eq!(None, iter.next());
itertools::assert_equal(vec![5], iter.into_buffer());
let mut iter = v.iter().cloned().tuples();
assert_eq!(Some((1, 2, 3)), iter.next());
assert_eq!(None, iter.next());
itertools::assert_equal(vec![4, 5], iter.into_buffer());
let mut iter = v.iter().cloned().tuples();
assert_eq!(Some((1, 2, 3, 4)), iter.next());
assert_eq!(None, iter.next());
itertools::assert_equal(vec![5], iter.into_buffer());
}
#[test]
fn tuple_windows() {
let v = [1, 2, 3, 4, 5];
let mut iter = v.iter().cloned().tuple_windows();
assert_eq!(Some((1,)), iter.next());
assert_eq!(Some((2,)), iter.next());
assert_eq!(Some((3,)), iter.next());
let mut iter = v.iter().cloned().tuple_windows();
assert_eq!(Some((1, 2)), iter.next());
assert_eq!(Some((2, 3)), iter.next());
assert_eq!(Some((3, 4)), iter.next());
assert_eq!(Some((4, 5)), iter.next());
assert_eq!(None, iter.next());
let mut iter = v.iter().cloned().tuple_windows();
assert_eq!(Some((1, 2, 3)), iter.next());
assert_eq!(Some((2, 3, 4)), iter.next());
assert_eq!(Some((3, 4, 5)), iter.next());
assert_eq!(None, iter.next());
let mut iter = v.iter().cloned().tuple_windows();
assert_eq!(Some((1, 2, 3, 4)), iter.next());
assert_eq!(Some((2, 3, 4, 5)), iter.next());
assert_eq!(None, iter.next());
let v = [1, 2, 3];
let mut iter = v.iter().cloned().tuple_windows::<(_, _, _, _)>();
assert_eq!(None, iter.next());
}
#[test]
fn next_tuple() {
let v = [1, 2, 3, 4, 5];
let mut iter = v.iter();
assert_eq!(iter.next_tuple().map(|(&x, &y)| (x, y)), Some((1, 2)));
assert_eq!(iter.next_tuple().map(|(&x, &y)| (x, y)), Some((3, 4)));
assert_eq!(iter.next_tuple::<(_, _)>(), None);
}
#[test]
fn collect_tuple() {
let v = [1, 2];
let iter = v.iter().cloned();
assert_eq!(iter.collect_tuple(), Some((1, 2)));
let v = [1];
let iter = v.iter().cloned();
assert_eq!(iter.collect_tuple::<(_, _)>(), None);
let v = [1, 2, 3];
let iter = v.iter().cloned();
assert_eq!(iter.collect_tuple::<(_, _)>(), None);
}
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