#[cfg(test)]
mod tests {
    use rand::Rng;

    #[test]
    fn gen_rnd() {
        let rnd_num: f64 = gen_rand();
        assert!(rnd_num > 0.);
    }

    fn gen_rand() -> f64 {
        let mut rng = rand::thread_rng();
        let random_number: f64 = rng.gen();
        random_number
    }
}