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Add test cases for ExactSizeIterator impls

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ByRef is not tested included because it is a trivial pass through.
This commit is contained in:
Steven Allen 2015-01-21 16:38:50 -05:00
parent a13e721202
commit 1479de8688
1 changed files with 57 additions and 4 deletions
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61
src/libcoretest/iter.rs
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@ -120,18 +120,32 @@ fn test_iterator_enumerate() {
fn test_iterator_peekable() {
let xs = vec![0u, 1, 2, 3, 4, 5];
let mut it = xs.iter().map(|&x|x).peekable();
assert_eq!(it.len(), 6);
assert_eq!(it.peek().unwrap(), &0);
assert_eq!(it.len(), 6);
assert_eq!(it.next().unwrap(), 0);
assert_eq!(it.len(), 5);
assert_eq!(it.next().unwrap(), 1);
assert_eq!(it.len(), 4);
assert_eq!(it.next().unwrap(), 2);
assert_eq!(it.len(), 3);
assert_eq!(it.peek().unwrap(), &3);
assert_eq!(it.len(), 3);
assert_eq!(it.peek().unwrap(), &3);
assert_eq!(it.len(), 3);
assert_eq!(it.next().unwrap(), 3);
assert_eq!(it.len(), 2);
assert_eq!(it.next().unwrap(), 4);
assert_eq!(it.len(), 1);
assert_eq!(it.peek().unwrap(), &5);
assert_eq!(it.len(), 1);
assert_eq!(it.next().unwrap(), 5);
assert_eq!(it.len(), 0);
assert!(it.peek().is_none());
assert_eq!(it.len(), 0);
assert!(it.next().is_none());
assert_eq!(it.len(), 0);
}
#[test]
@ -166,24 +180,45 @@ fn test_iterator_skip() {
let ys = [13, 15, 16, 17, 19, 20, 30];
let mut it = xs.iter().skip(5);
let mut i = 0;
for &x in it {
while let Some(&x) = it.next() {
assert_eq!(x, ys[i]);
i += 1;
assert_eq!(it.len(), xs.len()-5-i);
}
assert_eq!(i, ys.len());
assert_eq!(it.len(), 0);
}
#[test]
fn test_iterator_take() {
let xs = [0u, 1, 2, 3, 5, 13, 15, 16, 17, 19];
let ys = [0u, 1, 2, 3, 5];
let xs = [0us, 1, 2, 3, 5, 13, 15, 16, 17, 19];
let ys = [0us, 1, 2, 3, 5];
let mut it = xs.iter().take(5);
let mut i = 0;
for &x in it {
assert_eq!(it.len(), 5);
while let Some(&x) = it.next() {
assert_eq!(x, ys[i]);
i += 1;
assert_eq!(it.len(), 5-i);
}
assert_eq!(i, ys.len());
assert_eq!(it.len(), 0);
}
#[test]
fn test_iterator_take_short() {
let xs = [0us, 1, 2, 3];
let ys = [0us, 1, 2, 3];
let mut it = xs.iter().take(5);
let mut i = 0;
assert_eq!(it.len(), 4);
while let Some(&x) = it.next() {
assert_eq!(x, ys[i]);
i += 1;
assert_eq!(it.len(), 4-i);
}
assert_eq!(i, ys.len());
assert_eq!(it.len(), 0);
}
#[test]
@ -828,6 +863,24 @@ fn test_repeat() {
assert_eq!(it.next(), Some(42u));
}
#[test]
fn test_fuse() {
let mut it = 0us..3;
assert_eq!(it.len(), 3);
assert_eq!(it.next(), Some(0us));
assert_eq!(it.len(), 2);
assert_eq!(it.next(), Some(1us));
assert_eq!(it.len(), 1);
assert_eq!(it.next(), Some(2us));
assert_eq!(it.len(), 0);
assert_eq!(it.next(), None);
assert_eq!(it.len(), 0);
assert_eq!(it.next(), None);
assert_eq!(it.len(), 0);
assert_eq!(it.next(), None);
assert_eq!(it.len(), 0);
}
#[bench]
fn bench_rposition(b: &mut Bencher) {
let it: Vec<uint> = range(0u, 300).collect();