Shared via Rust Playground

playground.rs

pub fn fizz_buzz(i: i32) -> String {
    if i % 3 == 0 && i % 5 == 0 {
        "FizzBuzz".to_string()
    } else if i == 3 {
        "Fizz".to_string()
    } else if i == 5 {
        "Buzz".to_string()
    } else {
        i.to_string()
    }
}

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

    #[test]
    fn three_is_fizz() {
        assert_eq!("Fizz", fizz_buzz(3));
    }

    #[test]
    fn five_is_buzz() {
        assert_eq!("Buzz", fizz_buzz(5));
    }

    #[test]
    fn fifteen_is_fizzbuzz() {
        assert_eq!("FizzBuzz", fizz_buzz(15));
    }

    #[test]
    fn two_is_two() {
        assert_eq!("2", fizz_buzz(2));
    }
}