fn test_table_iterator_fwd_bwd()

in common/rusty_leveldb_sgx/src/table_reader.rs [495:543]

• 38 lines of code
• 6 McCabe index (conditional complexity)

    fn test_table_iterator_fwd_bwd() {
        let (src, size) = build_table(build_data());
        let data = build_data();

        let table = Table::new_raw(options::for_test(), wrap_buffer(src), size).unwrap();
        let mut iter = table.iter();
        let mut i = 0;

        while let Some((k, v)) = iter.next() {
            assert_eq!(
                (data[i].0.as_bytes(), data[i].1.as_bytes()),
                (k.as_ref(), v.as_ref())
            );
            i += 1;
        }

        assert_eq!(i, data.len());
        assert!(!iter.valid());

        // Go forward again, to last entry.
        while let Some((key, _)) = iter.next() {
            if key.as_slice() == b"zzz" {
                break;
            }
        }

        assert!(iter.valid());
        // backwards count
        let mut j = 0;

        while iter.prev() {
            if let Some((k, v)) = current_key_val(&iter) {
                j += 1;
                assert_eq!(
                    (
                        data[data.len() - 1 - j].0.as_bytes(),
                        data[data.len() - 1 - j].1.as_bytes()
                    ),
                    (k.as_ref(), v.as_ref())
                );
            } else {
                break;
            }
        }

        // expecting 7 - 1, because the last entry that the iterator stopped on is the last entry
        // in the table; that is, it needs to go back over 6 entries.
        assert_eq!(j, 6);
    }