Kumite

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

    fn do_test(string: &str, expected: &str) {
        assert_eq!(disemvowel(string), expected);
    }

#[test]
fn test() {
    do_test("HI GUYS", "H GYS");
    do_test("AEIOU", "");
    do_test("Shrek is an orge", "Shrk s n rg");
}

#[test]
fn random_tests() {
    for _ in 0..100 {
        let string = (0..rand::thread_rng().gen_range(0..20))
            .map(|_| rand::Rng::sample(&mut rand::thread_rng(), rand::distributions::Alphanumeric) as char)
            .collect::<String>();
        let expected = string.chars().filter(|&c| !"AEIOUaeiou".contains(c)).collect::<String>();
        do_test(&string, &expected);
    }
    }    
}