}
    }

    /**
     * Validates domain name
     *
     * @param domain the domain to validate
     * @throws IllegalArgumentException if domain is invalid
     */
    public static void validateDomain(String domain) {
        if (domain == null) {
            return; // Null domain allowed
        }
        if (domain.length() > MAX_DOMAIN_LENGTH) {

    @ValueSource(strings = { "domain", "domain.local", "sub.domain.com", "domain-01", "domain_test" })
    void testValidDomains(String domain) {
        assertDoesNotThrow(() -> InputValidator.validateDomain(domain));
    }

    @Test
    @DisplayName("Test safe integer addition")
    void testSafeAddition() {
        assertEquals(100, InputValidator.safeAdd(50, 50));