added a test for the short-circuiting behaviour

Author: yonikremer

library/core/tests/iter/traits/iterator.rs

@@ -637,6 +637,17 @@ fn test_edge_case_handling_iterator_with_duplicates() {
     assert!([1i32, 2i32, 2i32, 3i32].iter().has_item(&2i32));
 }
 
+#[test]
+/// Tests that short-circuiting works correctly when using `has_item`
+/// When you run the function, it should move the iterator forward after the first appearance of the item
+fn test_short_circuiting() {
+    let mut iterator = vec![1, 2, 3, 1, 1].into_iter();
+    assert!(iterator.has_item(&1));
+    assert_eq!(iterator.next(), Some(2));
+    assert!(!iterator.has_item(&4));
+    assert_eq!(iterator.next(), None);
+}
+
 #[test]
 fn test_edge_case_handling_iterator_with_custom_struct() {
     #[derive(PartialEq)]