aboutsummaryrefslogtreecommitdiff
path: root/tests/test_core.rs
diff options
context:
space:
mode:
Diffstat (limited to 'tests/test_core.rs')
-rw-r--r--tests/test_core.rs272
1 files changed, 272 insertions, 0 deletions
diff --git a/tests/test_core.rs b/tests/test_core.rs
new file mode 100644
index 0000000..5861653
--- /dev/null
+++ b/tests/test_core.rs
@@ -0,0 +1,272 @@
+//! Licensed under the Apache License, Version 2.0
+//! http://www.apache.org/licenses/LICENSE-2.0 or the MIT license
+//! http://opensource.org/licenses/MIT, at your
+//! option. This file may not be copied, modified, or distributed
+//! except according to those terms.
+#![no_std]
+
+use core::iter;
+use itertools as it;
+use crate::it::Itertools;
+use crate::it::interleave;
+use crate::it::multizip;
+use crate::it::free::put_back;
+use crate::it::iproduct;
+use crate::it::izip;
+
+#[test]
+fn product2() {
+ let s = "αβ";
+
+ let mut prod = iproduct!(s.chars(), 0..2);
+ assert!(prod.next() == Some(('α', 0)));
+ assert!(prod.next() == Some(('α', 1)));
+ assert!(prod.next() == Some(('β', 0)));
+ assert!(prod.next() == Some(('β', 1)));
+ assert!(prod.next() == None);
+}
+
+#[test]
+fn product_temporary() {
+ for (_x, _y, _z) in iproduct!(
+ [0, 1, 2].iter().cloned(),
+ [0, 1, 2].iter().cloned(),
+ [0, 1, 2].iter().cloned())
+ {
+ // ok
+ }
+}
+
+
+#[test]
+fn izip_macro() {
+ let mut zip = izip!(2..3);
+ assert!(zip.next() == Some(2));
+ assert!(zip.next().is_none());
+
+ let mut zip = izip!(0..3, 0..2, 0..2i8);
+ for i in 0..2 {
+ assert!((i as usize, i, i as i8) == zip.next().unwrap());
+ }
+ assert!(zip.next().is_none());
+
+ let xs: [isize; 0] = [];
+ let mut zip = izip!(0..3, 0..2, 0..2i8, &xs);
+ assert!(zip.next().is_none());
+}
+
+#[test]
+fn izip2() {
+ let _zip1: iter::Zip<_, _> = izip!(1.., 2..);
+ let _zip2: iter::Zip<_, _> = izip!(1.., 2.., );
+}
+
+#[test]
+fn izip3() {
+ let mut zip: iter::Map<iter::Zip<_, _>, _> = izip!(0..3, 0..2, 0..2i8);
+ for i in 0..2 {
+ assert!((i as usize, i, i as i8) == zip.next().unwrap());
+ }
+ assert!(zip.next().is_none());
+}
+
+#[test]
+fn multizip3() {
+ let mut zip = multizip((0..3, 0..2, 0..2i8));
+ for i in 0..2 {
+ assert!((i as usize, i, i as i8) == zip.next().unwrap());
+ }
+ assert!(zip.next().is_none());
+
+ let xs: [isize; 0] = [];
+ let mut zip = multizip((0..3, 0..2, 0..2i8, xs.iter()));
+ assert!(zip.next().is_none());
+
+ for (_, _, _, _, _) in multizip((0..3, 0..2, xs.iter(), &xs, xs.to_vec())) {
+ /* test compiles */
+ }
+}
+
+#[test]
+fn write_to() {
+ let xs = [7, 9, 8];
+ let mut ys = [0; 5];
+ let cnt = ys.iter_mut().set_from(xs.iter().map(|x| *x));
+ assert!(cnt == xs.len());
+ assert!(ys == [7, 9, 8, 0, 0]);
+
+ let cnt = ys.iter_mut().set_from(0..10);
+ assert!(cnt == ys.len());
+ assert!(ys == [0, 1, 2, 3, 4]);
+}
+
+#[test]
+fn test_interleave() {
+ let xs: [u8; 0] = [];
+ let ys = [7u8, 9, 8, 10];
+ let zs = [2u8, 77];
+ let it = interleave(xs.iter(), ys.iter());
+ it::assert_equal(it, ys.iter());
+
+ let rs = [7u8, 2, 9, 77, 8, 10];
+ let it = interleave(ys.iter(), zs.iter());
+ it::assert_equal(it, rs.iter());
+}
+
+#[allow(deprecated)]
+#[test]
+fn foreach() {
+ let xs = [1i32, 2, 3];
+ let mut sum = 0;
+ xs.iter().foreach(|elt| sum += *elt);
+ assert!(sum == 6);
+}
+
+#[test]
+fn dropping() {
+ let xs = [1, 2, 3];
+ let mut it = xs.iter().dropping(2);
+ assert_eq!(it.next(), Some(&3));
+ assert!(it.next().is_none());
+ let mut it = xs.iter().dropping(5);
+ assert!(it.next().is_none());
+}
+
+#[test]
+fn batching() {
+ let xs = [0, 1, 2, 1, 3];
+ let ys = [(0, 1), (2, 1)];
+
+ // An iterator that gathers elements up in pairs
+ let pit = xs.iter().cloned().batching(|it| {
+ match it.next() {
+ None => None,
+ Some(x) => match it.next() {
+ None => None,
+ Some(y) => Some((x, y)),
+ }
+ }
+ });
+ it::assert_equal(pit, ys.iter().cloned());
+}
+
+#[test]
+fn test_put_back() {
+ let xs = [0, 1, 1, 1, 2, 1, 3, 3];
+ let mut pb = put_back(xs.iter().cloned());
+ pb.next();
+ pb.put_back(1);
+ pb.put_back(0);
+ it::assert_equal(pb, xs.iter().cloned());
+}
+
+#[allow(deprecated)]
+#[test]
+fn step() {
+ it::assert_equal((0..10).step(1), 0..10);
+ it::assert_equal((0..10).step(2), (0..10).filter(|x: &i32| *x % 2 == 0));
+ it::assert_equal((0..10).step(10), 0..1);
+}
+
+#[allow(deprecated)]
+#[test]
+fn merge() {
+ it::assert_equal((0..10).step(2).merge((1..10).step(2)), 0..10);
+}
+
+
+#[test]
+fn repeatn() {
+ let s = "α";
+ let mut it = it::repeat_n(s, 3);
+ assert_eq!(it.len(), 3);
+ assert_eq!(it.next(), Some(s));
+ assert_eq!(it.next(), Some(s));
+ assert_eq!(it.next(), Some(s));
+ assert_eq!(it.next(), None);
+ assert_eq!(it.next(), None);
+}
+
+#[test]
+fn count_clones() {
+ // Check that RepeatN only clones N - 1 times.
+
+ use core::cell::Cell;
+ #[derive(PartialEq, Debug)]
+ struct Foo {
+ n: Cell<usize>
+ }
+
+ impl Clone for Foo
+ {
+ fn clone(&self) -> Self
+ {
+ let n = self.n.get();
+ self.n.set(n + 1);
+ Foo { n: Cell::new(n + 1) }
+ }
+ }
+
+
+ for n in 0..10 {
+ let f = Foo{n: Cell::new(0)};
+ let it = it::repeat_n(f, n);
+ // drain it
+ let last = it.last();
+ if n == 0 {
+ assert_eq!(last, None);
+ } else {
+ assert_eq!(last, Some(Foo{n: Cell::new(n - 1)}));
+ }
+ }
+}
+
+#[test]
+fn part() {
+ let mut data = [7, 1, 1, 9, 1, 1, 3];
+ let i = it::partition(&mut data, |elt| *elt >= 3);
+ assert_eq!(i, 3);
+ assert_eq!(data, [7, 3, 9, 1, 1, 1, 1]);
+
+ let i = it::partition(&mut data, |elt| *elt == 1);
+ assert_eq!(i, 4);
+ assert_eq!(data, [1, 1, 1, 1, 9, 3, 7]);
+
+ let mut data = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+ let i = it::partition(&mut data, |elt| *elt % 3 == 0);
+ assert_eq!(i, 3);
+ assert_eq!(data, [9, 6, 3, 4, 5, 2, 7, 8, 1]);
+}
+
+#[test]
+fn tree_fold1() {
+ for i in 0..100 {
+ assert_eq!((0..i).tree_fold1(|x, y| x + y), (0..i).fold1(|x, y| x + y));
+ }
+}
+
+#[test]
+fn exactly_one() {
+ assert_eq!((0..10).filter(|&x| x == 2).exactly_one().unwrap(), 2);
+ assert!((0..10).filter(|&x| x > 1 && x < 4).exactly_one().unwrap_err().eq(2..4));
+ assert!((0..10).filter(|&x| x > 1 && x < 5).exactly_one().unwrap_err().eq(2..5));
+ assert!((0..10).filter(|&_| false).exactly_one().unwrap_err().eq(0..0));
+}
+
+#[test]
+fn sum1() {
+ let v: &[i32] = &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+ assert_eq!(v[..0].iter().cloned().sum1::<i32>(), None);
+ assert_eq!(v[1..2].iter().cloned().sum1::<i32>(), Some(1));
+ assert_eq!(v[1..3].iter().cloned().sum1::<i32>(), Some(3));
+ assert_eq!(v.iter().cloned().sum1::<i32>(), Some(55));
+}
+
+#[test]
+fn product1() {
+ let v: &[i32] = &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+ assert_eq!(v[..0].iter().cloned().product1::<i32>(), None);
+ assert_eq!(v[..1].iter().cloned().product1::<i32>(), Some(0));
+ assert_eq!(v[1..3].iter().cloned().product1::<i32>(), Some(2));
+ assert_eq!(v[1..5].iter().cloned().product1::<i32>(), Some(24));
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-27 15:45:59 +0000