How to test database code in Rust

Use the #[test] attribute on functions that verify your database logic, then run them with cargo test.

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_database_insert() {
        let db = Database::new();
        db.insert("key", "value").unwrap();
        assert_eq!(db.get("key"), Some("value"));
    }
}

Run the tests:

cargo test

You write small functions that check if your database code works correctly, like checking if a saved item can be found again. You mark these functions with a special tag so the Rust tool knows to run them automatically. It's like a quality control checklist that runs every time you save your code.