Function intersection_default

rust/stringzilla.rs:3743–3768

()

    #[test]
    fn intersection_default() {
        // Two slices of string literals.
        let set1 = ["banana", "apple", "cherry"];
        let set2 = ["cherry", "orange", "pineapple", "banana"];
        // Output buffers: size must be at least min(set1.len(), set2.len()).
        let mut out1 = [0; 3];
        let mut out2 = [0; 3];

        let n = sz::intersection(&set1, &set2, 0, &mut out1, &mut out2).expect("intersection failed");
        assert!(n <= set1.len().min(set2.len()));

        // For simplicity, we will compare the intersection from the first set.
        // Our API returns indices (for set1 in out1).
        let common_from_api: HashSet<_> = out1[..n].iter().map(|&i| set1[i]).collect();

        // Compute the expected intersection using a `HashSet`.
        let expected: HashSet<_> = set1
            .iter()
            .cloned()
            .collect::<HashSet<_>>()
            .intersection(&set2.iter().cloned().collect())
            .cloned()
            .collect();

        assert_eq!(common_from_api, expected);
    }

    #[test]
    fn intersection_by_custom() {