IBAN validation Javascript class

iban.js

class IBAN {
    static code_lengths = {
        AD: 24, AE: 23, AT: 20, AZ: 28, BA: 20, BE: 16, BG: 22, BH: 22, BR: 29, CH: 21,
        CR: 21, CY: 28, CZ: 24, DE: 22, DK: 18, DO: 28, EE: 20, ES: 24, FI: 18, FO: 18,
        FR: 27, GB: 22, GI: 23, GL: 18, GR: 27, GT: 28, HR: 21, HU: 28, IE: 22, IL: 23,
        IS: 26, IT: 27, JO: 30, KW: 30, KZ: 20, LB: 28, LI: 21, LT: 20, LU: 20, LV: 21,
        MC: 27, MD: 24, ME: 22, MK: 19, MR: 27, MT: 31, MU: 30, NL: 18, NO: 15, PK: 24,
        PL: 28, PS: 29, PT: 25, QA: 29, RO: 24, RS: 22, SA: 24, SE: 24, SI: 19, SK: 24,
        SM: 27, TN: 24, TR: 26, AL: 28, BY: 28, CR: 22, EG: 29, GE: 22, IQ: 23, LC: 32,
        SC: 31, ST: 25, SV: 28, TL: 23, UA: 29, VA: 22, VG: 24, XK: 20,
    };

    static mod97 = (str) => {
        var checksum = str.slice(0, 2), fragment;
        for (var offset = 2; offset < str.length; offset += 7) {
            fragment = String(checksum) + str.substring(offset, offset + 7);
            checksum = parseInt(fragment, 10) % 97;
        }
        return checksum;
    };

    static isValid = (input) => {
        // keep only alphanumeric characters
        let iban = String(input).toUpperCase().replace(/[^A-Z0-9]/g, ''),
            // match and capture (1) the country code, (2) the check digits, and (3) the rest
            code = iban.match(/^([A-Z]{2})(\d{2})([A-Z\d]+)$/),
            digits;
        
        // check syntax and length
        if (!code || iban.length !== IBAN.code_lengths[code[1]]) {
            return false;
        }
    
        // rearrange country code and check digits, and convert chars to ints
        digits = (code[3] + code[1] + code[2]).replace(/[A-Z]/g, function (letter) {
            return letter.charCodeAt(0) - 55;
        });
    
        // final check
        return IBAN.mod97(digits) === 1;
    };
}

// Test suite for IBAN class
const testSuite = () => {
    const validIbans = [
        "GB82WEST12345698765432",
        "FR7630006000011234567890189",
        "DE75512108001245126199",
        "ES9121000418450200051332",
        "AT611904300234573201",
        "BE68539007547034",
        "CH9300762011623852957",
    ];

    const invalidIbans = [
        "GB81WEST12345698765432", // invalid check digit
        "FR7630006000011234567890188", // invalid check digit
        "DE75512108001245126198", // invalid check digit
        "ES9121000418450200051331", // invalid check digit
        "AT611904300234573200", // invalid length
        "BE68539007547035", // invalid check digit
        "CH9300762011623852958", // invalid check digit
        "US64SVBKUS6S330095238", // invalid country code
        "Not an IBAN", // invalid format
        "", // empty string
    ];

    console.log("Running tests...");

    // Test isValid() method with valid IBANs
    validIbans.forEach(iban => {
        if (!IBAN.isValid(iban)) {
            console.error(`Validation failed for valid IBAN: ${iban}`);
        }
    });

    // Test isValid() method with invalid IBANs
    invalidIbans.forEach(iban => {
        if (IBAN.isValid(iban)) {
            console.error(`Validation passed for invalid IBAN: ${iban}`);
        }
    });

    console.log("Tests complete.");
};

// Run the test suite
testSuite();