1use itertools::Itertools;
2use itertools::EitherOrBoth::{Both, Left, Right};
3use itertools::free::zip_eq;
4use itertools::multizip;
5
6#[test]
7fn zip_longest_fused() {
8 let a = [Some(1), None, Some(3), Some(4)];
9 let b = [1, 2, 3];
10
11 let unfused = a.iter().batching(|it| *it.next().unwrap())
12 .zip_longest(b.iter().cloned());
13 itertools::assert_equal(unfused,
14 vec![Both(1, 1), Right(2), Right(3)]);
15}
16
17#[test]
18fn test_zip_longest_size_hint() {
19 let c = (1..10).cycle();
20 let v: &[_] = &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
21 let v2 = &[10, 11, 12];
22
23 assert_eq!(c.zip_longest(v.iter()).size_hint(), (std::usize::MAX, None));
24
25 assert_eq!(v.iter().zip_longest(v2.iter()).size_hint(), (10, Some(10)));
26}
27
28#[test]
29fn test_double_ended_zip_longest() {
30 let xs = [1, 2, 3, 4, 5, 6];
31 let ys = [1, 2, 3, 7];
32 let a = xs.iter().copied();
33 let b = ys.iter().copied();
34 let mut it = a.zip_longest(b);
35 assert_eq!(it.next(), Some(Both(1, 1)));
36 assert_eq!(it.next(), Some(Both(2, 2)));
37 assert_eq!(it.next_back(), Some(Left(6)));
38 assert_eq!(it.next_back(), Some(Left(5)));
39 assert_eq!(it.next_back(), Some(Both(4, 7)));
40 assert_eq!(it.next(), Some(Both(3, 3)));
41 assert_eq!(it.next(), None);
42}
43
44#[test]
45fn test_double_ended_zip() {
46 let xs = [1, 2, 3, 4, 5, 6];
47 let ys = [1, 2, 3, 7];
48 let a = xs.iter().copied();
49 let b = ys.iter().copied();
50 let mut it = multizip((a, b));
51 assert_eq!(it.next_back(), Some((4, 7)));
52 assert_eq!(it.next_back(), Some((3, 3)));
53 assert_eq!(it.next_back(), Some((2, 2)));
54 assert_eq!(it.next_back(), Some((1, 1)));
55 assert_eq!(it.next_back(), None);
56}
57
58
59#[should_panic]
60#[test]
61fn zip_eq_panic1()
62{
63 let a = [1, 2];
64 let b = [1, 2, 3];
65
66 zip_eq(&a, &b).count();
67}
68
69#[should_panic]
70#[test]
71fn zip_eq_panic2()
72{
73 let a: [i32; 0] = [];
74 let b = [1, 2, 3];
75
76 zip_eq(&a, &b).count();
77}
78