Test with error (unhautorized) for the refresh token with only the refresh token, since a `confidential` client is used for testing.

src/test/java/org/gcube/common/keycloak/TestKeycloakClient.java

@@ -79,4 +79,10 @@ public class TestKeycloakClient {
         TestModels.checkRefreshToken(ModelUtils.getRefreshTokenFrom(refreshedTR));
     }
 
+    @Test(expected = KeycloakClientException.class)
+    public void test6RefreshTokenWithDiscoveryAndClientIdFromRefreshToken() throws Exception {
+        logger.info("Start testing refresh UMA token with error since is not a public client...");
+        KeycloakClientFactory.newInstance().refreshToken(tr.getRefreshToken());
+    }
+
 }