kcode-credits 0.1.1

Kennedy's separate persistent gamification-credit balance capability
Documentation 
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use kcode_credits::{Balance, Credits, Error};

#[test]
fn awards_persist_and_advance_the_small_global_revision() {
    let directory = tempfile::tempdir().unwrap();
    let path = directory.path().join("credits.sqlite3");
    let credits = Credits::open(&path).unwrap();
    assert_eq!(
        credits.balance("user-a").unwrap(),
        Balance {
            amount: 0,
            revision: 0
        }
    );
    assert_eq!(
        credits.award("user-a", 7).unwrap(),
        Balance {
            amount: 7,
            revision: 1
        }
    );
    assert_eq!(
        Credits::open(path)
            .unwrap()
            .balance("user-a")
            .unwrap()
            .amount,
        7
    );
}

#[test]
fn rejects_empty_users_and_overflows() {
    let directory = tempfile::tempdir().unwrap();
    let credits = Credits::open(directory.path().join("credits.sqlite3")).unwrap();
    assert!(matches!(credits.balance(" "), Err(Error::EmptyUserId)));
    credits.award("user-a", i64::MAX as u64).unwrap();
    assert!(matches!(
        credits.award("user-a", 1),
        Err(Error::AmountOutOfRange)
    ));
}