1 files changed, 77 insertions, 0 deletions
diff --git a/third_party/rust/itertools/tests/zip.rs b/third_party/rust/itertools/tests/zip.rs
new file mode 100644
index 0000000000..75157d34f3
--- /dev/null
+++ b/third_party/rust/itertools/tests/zip.rs
@@ -0,0 +1,77 @@
+use itertools::Itertools;
+use itertools::EitherOrBoth::{Both, Left, Right};
+use itertools::free::zip_eq;
+use itertools::multizip;
+
+#[test]
+fn zip_longest_fused() {
+    let a = [Some(1), None, Some(3), Some(4)];
+    let b = [1, 2, 3];
+
+    let unfused = a.iter().batching(|it| *it.next().unwrap())
+        .zip_longest(b.iter().cloned());
+    itertools::assert_equal(unfused,
+                       vec![Both(1, 1), Right(2), Right(3)]);
+}
+
+#[test]
+fn test_zip_longest_size_hint() {
+    let c = (1..10).cycle();
+    let v: &[_] = &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+    let v2 = &[10, 11, 12];
+
+    assert_eq!(c.zip_longest(v.iter()).size_hint(), (std::usize::MAX, None));
+
+    assert_eq!(v.iter().zip_longest(v2.iter()).size_hint(), (10, Some(10)));
+}
+
+#[test]
+fn test_double_ended_zip_longest() {
+    let xs = [1, 2, 3, 4, 5, 6];
+    let ys = [1, 2, 3, 7];
+    let a = xs.iter().copied();
+    let b = ys.iter().copied();
+    let mut it = a.zip_longest(b);
+    assert_eq!(it.next(), Some(Both(1, 1)));
+    assert_eq!(it.next(), Some(Both(2, 2)));
+    assert_eq!(it.next_back(), Some(Left(6)));
+    assert_eq!(it.next_back(), Some(Left(5)));
+    assert_eq!(it.next_back(), Some(Both(4, 7)));
+    assert_eq!(it.next(), Some(Both(3, 3)));
+    assert_eq!(it.next(), None);
+}
+
+#[test]
+fn test_double_ended_zip() {
+    let xs = [1, 2, 3, 4, 5, 6];
+    let ys = [1, 2, 3, 7];
+    let a = xs.iter().copied();
+    let b = ys.iter().copied();
+    let mut it = multizip((a, b));
+    assert_eq!(it.next_back(), Some((4, 7)));
+    assert_eq!(it.next_back(), Some((3, 3)));
+    assert_eq!(it.next_back(), Some((2, 2)));
+    assert_eq!(it.next_back(), Some((1, 1)));
+    assert_eq!(it.next_back(), None);
+}
+
+
+#[should_panic]
+#[test]
+fn zip_eq_panic1()
+{
+    let a = [1, 2];
+    let b = [1, 2, 3];
+
+    zip_eq(&a, &b).count();
+}
+
+#[should_panic]
+#[test]
+fn zip_eq_panic2()
+{
+    let a: [i32; 0] = [];
+    let b = [1, 2, 3];
+
+    zip_eq(&a, &b).count();
+}