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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
   * limitations under the License.
   */
  
  package org.apache.cassandra.simulator.test;
  
  import java.io.IOException;
  import java.util.IdentityHashMap;
  
  import org.junit.Test;
  
  import org.apache.cassandra.concurrent.ExecutorFactory;
  import org.apache.cassandra.concurrent.ExecutorPlus;
  import org.apache.cassandra.distributed.api.ConsistencyLevel;
  import org.apache.cassandra.simulator.ActionList;
  import org.apache.cassandra.simulator.cluster.ClusterActions;
  import org.apache.cassandra.utils.concurrent.CountDownLatch;
  
  import static org.apache.cassandra.simulator.cluster.ClusterActions.InitialConfiguration.initializeAll;
  
  public class TrivialSimulationTest extends SimulationTestBase
  {
      @Test
      public void identityHashMapTest()
      {
          simulate(arr(() -> new IdentityHashMap<>().put(1, 1)),
                   () -> {});
      }
  
      @Test
      public void trivialTest() throws IOException // for demonstration/experiment purposes
      {
          simulate((simulation) -> {
                       ClusterActions clusterActions = ClusterActions.simple(simulation.simulated, simulation.cluster);
                       return ActionList.of(clusterActions.initializeCluster(initializeAll(simulation.cluster.size())),
                                            simulation.schemaChange(1, "CREATE KEYSPACE ks WITH replication = {'class': 'NetworkTopologyStrategy', 'replication_factor' : 3}"),
                                            simulation.schemaChange(1, "CREATE TABLE IF NOT EXISTS ks.tbl (pk int PRIMARY KEY, v int)"));
                   },
                   (simulation) -> ActionList.of(simulation.executeQuery(1, "INSERT INTO ks.tbl (pk, v) VALUES (1,1)", ConsistencyLevel.QUORUM),
                                                 simulation.executeQuery(1, "SELECT * FROM ks.tbl WHERE pk = 1", ConsistencyLevel.QUORUM)),
                   (simulation) -> ActionList.of(),
                   (config) -> config
                               .threadCount(10)
                               .nodes(3, 3)
                               .dcs(1, 1));
      }
  
      @Test
      public void componentTest()
      {
          simulate(arr(() -> {
                       ExecutorPlus executor = ExecutorFactory.Global.executorFactory().pooled("name", 10);
                       CountDownLatch latch = CountDownLatch.newCountDownLatch(5);
  
                       for (int i = 0; i < 5; i++)
                       {
                           executor.submit(() -> {
                               latch.decrement();
                               try
                               {
                                   latch.await();
                               }
                               catch (InterruptedException e)
                               {
                                   throw new RuntimeException(e);
                               }
                           });
                       }
                   }),
                   () -> {});
      }
  
  
  }
  