#[test_case(vec![(1,1),(2,2),(3,3)].iter().collect(), vec![(1,1),(2,2),(3,3)].iter().collect() ; "test")]
    fn get_changes_values<
        'a,
        'b,
        K: Eq + Ord + Clone + fmt::Debug,
        V: Eq + fmt::Debug,
    >(
        old: &'b BTreeMap<&'a K, V>,
        new: &'b BTreeMap<&'a K, V>,
    ) {
        let changes = super::get_changes_values(old, new);
        // test_case => "test"
        assert_debug_snapshot(test_case, changes);
    }