fakeit 1.4.0

Fake data generator library with 130+ functions
Documentation 
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use crate::data::payment;
use crate::misc;
use simplerand::randn;

pub struct CreditCard {
    type_of: String,
    number: String,
    exp: String,
    cvv: String,
}

pub fn credit_card() -> CreditCard {
    CreditCard {
        type_of: credit_card_type(),
        number: credit_card_number(),
        exp: credit_card_exp(),
        cvv: credit_card_cvv(),
    }
}

pub fn credit_card_type() -> String {
    misc::random_data(payment::CARD_TYPE).to_string()
}

pub fn credit_card_number() -> String {
    misc::replace_with_numbers(misc::random_data(payment::NUMBER).to_string())
}

fn gen_random_num(length: usize) -> Vec<i32> {
    let mut nums = vec![0i32; length];
    for x in &mut nums {
        *x = randn(9);
    }
    nums
}

pub fn credit_card_luhn_number() -> String {
    let mii = randn(9); //MII (Major Industry Identifier)
    let nums = gen_random_num(14);
    let iin = [
        mii.to_string(),
        nums.iter().map(ToString::to_string).collect(),
    ]
    .join("");
    let mut total = 0;

    for (i, val) in iin.chars().rev().enumerate() {
        if i % 2 != 0 {
            total += val.to_digit(10).expect("error");
        } else {
            let double = val.to_digit(10).expect("error") * 2;
            let digits = double.to_string();
            if digits.len() > 1 {
                for j in digits.chars() {
                    total += j.to_digit(10).expect("error");
                }
            } else {
                total += double;
            }
        }
    }
    let check = 10 - (total % 10) % 10;
    format!("{iin}{check}")
}

pub fn credit_card_exp() -> String {
    let current_year = misc::current_year() as i32 - 2000;
    let month = misc::random(1, 12);
    if month < 10 {
        format!(
            "{}/{}",
            format!("0{}", month).as_str(),
            current_year + misc::random(1, 10)
        )
    } else {
        format!(
            "{}/{}",
            format!("{}", month).as_str(),
            current_year + misc::random(1, 10)
        )
    }
}

pub fn credit_card_cvv() -> String {
    misc::replace_with_numbers("###".to_string())
}

#[cfg(test)]
mod tests {
    use crate::payment;
    use crate::testify::exec_mes;

    #[test]
    fn credit_card_type() {
        exec_mes("payment::credit_card_type", payment::credit_card_type);
    }

    #[test]
    fn credit_card_number() {
        exec_mes("payment::credit_card_number", || {
            payment::credit_card_number()
        });
    }

    #[test]
    fn credit_card_luhn_number() {
        exec_mes("payment::credit_card_luhn_number", || {
            payment::credit_card_luhn_number()
        });
    }

    #[test]
    fn credit_card_exp() {
        exec_mes("payment::credit_card_exp", payment::credit_card_exp);
    }

    #[test]
    fn credit_card_cvv() {
        exec_mes("payment::credit_card_cvv", payment::credit_card_cvv);
    }
}