public SaslExtensions extensions() {
        return saslExtensions;
    }
@Test
    public void testExtensions() throws Exception {
        String message = "n,,\u0001propA=valueA1, valueA2\u0001auth=Bearer 567\u0001propB=valueB\u0001\u0001";
        OAuthBearerClientInitialResponse response = new OAuthBearerClientInitialResponse(message.getBytes(StandardCharsets.UTF_8));
        assertEquals("567", response.tokenValue());
        assertEquals("", response.authorizationId());
        assertEquals("valueA1, valueA2", response.extensions().map().get("propA"));
        assertEquals("valueB", response.extensions().map().get("propB"));
    }