Initial import of itertools-0.9.0.
Bug: 155309706
Change-Id: Id790c146e836f0eadfb0d8a103cbe2d226a598c3
diff --git a/tests/tuples.rs b/tests/tuples.rs
new file mode 100644
index 0000000..9fc8b3c
--- /dev/null
+++ b/tests/tuples.rs
@@ -0,0 +1,86 @@
+use itertools::Itertools;
+
+#[test]
+fn tuples() {
+ let v = [1, 2, 3, 4, 5];
+ let mut iter = v.iter().cloned().tuples();
+ assert_eq!(Some((1,)), iter.next());
+ assert_eq!(Some((2,)), iter.next());
+ assert_eq!(Some((3,)), iter.next());
+ assert_eq!(Some((4,)), iter.next());
+ assert_eq!(Some((5,)), iter.next());
+ assert_eq!(None, iter.next());
+ assert_eq!(None, iter.into_buffer().next());
+
+ let mut iter = v.iter().cloned().tuples();
+ assert_eq!(Some((1, 2)), iter.next());
+ assert_eq!(Some((3, 4)), iter.next());
+ assert_eq!(None, iter.next());
+ itertools::assert_equal(vec![5], iter.into_buffer());
+
+ let mut iter = v.iter().cloned().tuples();
+ assert_eq!(Some((1, 2, 3)), iter.next());
+ assert_eq!(None, iter.next());
+ itertools::assert_equal(vec![4, 5], iter.into_buffer());
+
+ let mut iter = v.iter().cloned().tuples();
+ assert_eq!(Some((1, 2, 3, 4)), iter.next());
+ assert_eq!(None, iter.next());
+ itertools::assert_equal(vec![5], iter.into_buffer());
+}
+
+#[test]
+fn tuple_windows() {
+ let v = [1, 2, 3, 4, 5];
+
+ let mut iter = v.iter().cloned().tuple_windows();
+ assert_eq!(Some((1,)), iter.next());
+ assert_eq!(Some((2,)), iter.next());
+ assert_eq!(Some((3,)), iter.next());
+
+ let mut iter = v.iter().cloned().tuple_windows();
+ assert_eq!(Some((1, 2)), iter.next());
+ assert_eq!(Some((2, 3)), iter.next());
+ assert_eq!(Some((3, 4)), iter.next());
+ assert_eq!(Some((4, 5)), iter.next());
+ assert_eq!(None, iter.next());
+
+ let mut iter = v.iter().cloned().tuple_windows();
+ assert_eq!(Some((1, 2, 3)), iter.next());
+ assert_eq!(Some((2, 3, 4)), iter.next());
+ assert_eq!(Some((3, 4, 5)), iter.next());
+ assert_eq!(None, iter.next());
+
+ let mut iter = v.iter().cloned().tuple_windows();
+ assert_eq!(Some((1, 2, 3, 4)), iter.next());
+ assert_eq!(Some((2, 3, 4, 5)), iter.next());
+ assert_eq!(None, iter.next());
+
+ let v = [1, 2, 3];
+ let mut iter = v.iter().cloned().tuple_windows::<(_, _, _, _)>();
+ assert_eq!(None, iter.next());
+}
+
+#[test]
+fn next_tuple() {
+ let v = [1, 2, 3, 4, 5];
+ let mut iter = v.iter();
+ assert_eq!(iter.next_tuple().map(|(&x, &y)| (x, y)), Some((1, 2)));
+ assert_eq!(iter.next_tuple().map(|(&x, &y)| (x, y)), Some((3, 4)));
+ assert_eq!(iter.next_tuple::<(_, _)>(), None);
+}
+
+#[test]
+fn collect_tuple() {
+ let v = [1, 2];
+ let iter = v.iter().cloned();
+ assert_eq!(iter.collect_tuple(), Some((1, 2)));
+
+ let v = [1];
+ let iter = v.iter().cloned();
+ assert_eq!(iter.collect_tuple::<(_, _)>(), None);
+
+ let v = [1, 2, 3];
+ let iter = v.iter().cloned();
+ assert_eq!(iter.collect_tuple::<(_, _)>(), None);
+}