Function tail_n

crates/core/src/database_logger.rs:728–761

Test calling [DatabaseLogger::tail] with `Some(n)`. Like `tail -n`.

(logger: DatabaseLogger)

    ///
    /// Like `tail -n`.
    async fn tail_n(logger: DatabaseLogger) {
        let logger = Arc::new(logger);

        write_logs(logger.clone(), 0..10).await;

        let a = logger
            .tail(Some(10), false)
            .await
            .unwrap()
            .try_collect::<BytesMut>()
            .await
            .unwrap();
        let b = logger
            .tail(None, false)
            .await
            .unwrap()
            .try_collect::<BytesMut>()
            .await
            .unwrap();
        assert_eq!(a, b);

        let c = logger
            .tail(Some(5), false)
            .await
            .unwrap()
            .try_collect::<BytesMut>()
            .await
            .unwrap();
        let json_logs = deserialize_logs(&c).unwrap();

        assert_eq!(json_logs.len(), 5);
        assert_eq!(json_logs[0].message, "log line 5");
        assert_eq!(json_logs[4].message, "log line 9");
    }

    /// Test calling [DatabaseLogger::tail] with
    /// `follow = true`.