76 lines
1.6 KiB
Rust
76 lines
1.6 KiB
Rust
use core::iter::*;
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#[test]
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fn test_fuse_nth() {
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let xs = [0, 1, 2];
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let mut it = xs.iter();
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assert_eq!(it.len(), 3);
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assert_eq!(it.nth(2), Some(&2));
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assert_eq!(it.len(), 0);
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assert_eq!(it.nth(2), None);
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assert_eq!(it.len(), 0);
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}
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#[test]
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fn test_fuse_last() {
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let xs = [0, 1, 2];
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let it = xs.iter();
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assert_eq!(it.len(), 3);
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assert_eq!(it.last(), Some(&2));
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}
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#[test]
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fn test_fuse_count() {
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let xs = [0, 1, 2];
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let it = xs.iter();
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assert_eq!(it.len(), 3);
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assert_eq!(it.count(), 3);
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// Can't check len now because count consumes.
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}
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#[test]
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fn test_fuse_fold() {
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let xs = [0, 1, 2];
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let it = xs.iter(); // `FusedIterator`
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let i = it.fuse().fold(0, |i, &x| {
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assert_eq!(x, xs[i]);
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i + 1
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});
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assert_eq!(i, xs.len());
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let it = xs.iter(); // `FusedIterator`
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let i = it.fuse().rfold(xs.len(), |i, &x| {
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assert_eq!(x, xs[i - 1]);
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i - 1
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});
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assert_eq!(i, 0);
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let it = xs.iter().scan((), |_, &x| Some(x)); // `!FusedIterator`
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let i = it.fuse().fold(0, |i, x| {
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assert_eq!(x, xs[i]);
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i + 1
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});
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assert_eq!(i, xs.len());
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}
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#[test]
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fn test_fuse() {
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let mut it = 0..3;
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assert_eq!(it.len(), 3);
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assert_eq!(it.next(), Some(0));
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assert_eq!(it.len(), 2);
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assert_eq!(it.next(), Some(1));
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assert_eq!(it.len(), 1);
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assert_eq!(it.next(), Some(2));
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assert_eq!(it.len(), 0);
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assert_eq!(it.next(), None);
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assert_eq!(it.len(), 0);
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assert_eq!(it.next(), None);
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assert_eq!(it.len(), 0);
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assert_eq!(it.next(), None);
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assert_eq!(it.len(), 0);
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}
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