retainer 0.3.0

Minimal async cache in Rust with support for key expirations
Documentation 
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use retainer::*;

#[tokio::test]
async fn test_cache_size_operations() {
    let cache = Cache::<u8, u8>::new();

    cache.insert(1, 2, CacheExpiration::none()).await;
    cache.insert(2, 2, CacheExpiration::none()).await;
    cache.insert(3, 3, CacheExpiration::none()).await;

    assert_eq!(cache.len().await, 3);
    assert_eq!(cache.expired().await, 0);
    assert_eq!(cache.unexpired().await, 3);

    cache.clear().await;

    assert_eq!(cache.len().await, 0);
    assert_eq!(cache.expired().await, 0);
    assert_eq!(cache.unexpired().await, 0);
}

#[tokio::test]
async fn test_cache_update_operations() {
    let cache = Cache::<u8, u8>::new();

    cache.insert(1, 1, CacheExpiration::none()).await;

    assert_eq!(cache.get(&1).await.unwrap().value(), &1);

    cache
        .update(&1, |value| {
            *value = 5;
        })
        .await;

    assert_eq!(cache.get(&1).await.unwrap().value(), &5);
}