@Override
            public String getTokenPublicId(final String token) {
                return null;
            }
This is {@link DefaultYubiKeyAccountValidatorTests}.

@author Misagh Moayyed
@since 5.3.0
support/cas-server-support-yubikey-core/src/test/java/org/apereo/cas/adaptors/yubikey/DefaultYubiKeyAccountValidatorTests.java