fn test_block_iterate_reverse()

in common/rusty_leveldb_sgx/src/block.rs [388:431]

• 37 lines of code
• 3 McCabe index (conditional complexity)

    fn test_block_iterate_reverse() {
        let mut o = options::for_test();
        o.block_restart_interval = 3;
        let data = get_data();
        let mut builder = BlockBuilder::new(o.clone());

        for &(k, v) in data.iter() {
            builder.add(k, v);
        }

        let block_contents = builder.finish();
        let mut block = Block::new(o.clone(), block_contents).iter();

        assert!(!block.valid());
        assert_eq!(
            block.next(),
            Some(("key1".as_bytes().to_vec(), "value1".as_bytes().to_vec()))
        );
        assert!(block.valid());
        block.next();
        assert!(block.valid());
        block.prev();
        assert!(block.valid());
        assert_eq!(
            current_key_val(&block),
            Some(("key1".as_bytes().to_vec(), "value1".as_bytes().to_vec()))
        );
        block.prev();
        assert!(!block.valid());

        // Verify that prev() from the last entry goes to the prev-to-last entry
        // (essentially, that next() returning None doesn't advance anything)
        while let Some(_) = block.next() {}

        block.prev();
        assert!(block.valid());
        assert_eq!(
            current_key_val(&block),
            Some((
                "prefix_key2".as_bytes().to_vec(),
                "value".as_bytes().to_vec()
            ))
        );
    }