fn wrapping_add()

in src/storage/seg/src/tests.rs [413:449]

• 35 lines of code
• 1 McCabe index (conditional complexity)

fn wrapping_add() {
    let ttl = Duration::ZERO;
    let segment_size = 4096;
    let segments = 64;
    let heap_size = segments * segment_size as usize;

    let mut cache = Seg::builder()
        .segment_size(segment_size)
        .heap_size(heap_size)
        .build()
        .expect("failed to create cache");
    assert_eq!(cache.items(), 0);
    assert_eq!(cache.segments.free(), 64);
    assert!(cache.insert(b"coffee", 0, None, ttl).is_ok());
    assert_eq!(cache.segments.free(), 63);
    assert_eq!(cache.items(), 1);
    assert!(cache.get(b"coffee").is_some());

    let item = cache.get(b"coffee").unwrap();
    assert_eq!(item.value(), 0, "item is: {:?}", item);
    cache
        .wrapping_add(b"coffee", 1)
        .expect("failed to increment");
    assert_eq!(item.value(), 1, "item is: {:?}", item);
    cache
        .wrapping_add(b"coffee", u64::MAX - 1)
        .expect("failed to increment");
    assert_eq!(item.value(), u64::MAX, "item is: {:?}", item);
    cache
        .wrapping_add(b"coffee", 1)
        .expect("failed to increment");
    assert_eq!(item.value(), 0, "item is: {:?}", item);
    cache
        .wrapping_add(b"coffee", 2)
        .expect("failed to increment");
    assert_eq!(item.value(), 2, "item is: {:?}", item);
}