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fn main() {
    println!("Hello, world!");
}

pub fn add_one(x: i32) -> i32 {
    x + 1
}

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

    #[test]
    fn test_add() {
        assert_eq!(add_one(1), 2);
        assert_eq!(add_one(-1), 0);
    }
}