@Test
    public void authorizationIdNotEqualsAuthenticationId() {
        assertThrows(SaslAuthenticationException.class,
            () -> saslServer.evaluateResponse(clientInitialResponse(USER + "x")));
    }
If the callback handler handles the `OAuthBearerExtensionsValidatorCallback`
 and finds an invalid extension, SaslServer should throw an authentication exception
clients/src/test/java/org/apache/kafka/common/security/oauthbearer/internals/OAuthBearerSaslServerTest.java