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   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
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   */
  
  package org.apache.cassandra.distributed.test;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.Feature;
  
  public class PaxosUncommittedIndexTest extends TestBaseImpl
  {
      @Test
      public void indexCqlIsExportableAndParsableTest() throws Throwable
      {
          String expectedCreateCustomIndex = "CREATE CUSTOM INDEX \"PaxosUncommittedIndex\" ON system.paxos () USING 'org.apache.cassandra.service.paxos.uncommitted.PaxosUncommittedIndex'";
          try (Cluster dtestCluster = init(Cluster.build(1).withConfig(c -> c.with(Feature.NATIVE_PROTOCOL)).start()))
          {
              try (com.datastax.driver.core.Cluster clientCluster = com.datastax.driver.core.Cluster.builder().addContactPoint("127.0.0.1").build())
              {
                  Assert.assertTrue(clientCluster.getMetadata().exportSchemaAsString()
                                                 .contains(expectedCreateCustomIndex));
                  Throwable thrown = null;
                  try
                  {
                      dtestCluster.schemaChange(expectedCreateCustomIndex);
                  }
                  catch (Throwable tr)
                  {
                      thrown = tr;
                  }
  
                  // Check parsing succeeds and index creation fails
                  Assert.assertTrue(thrown.getMessage().contains("System keyspace 'system' is not user-modifiable"));
              }
          }
      }
  }