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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.
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  package org.apache.cassandra.locator;
  
  import java.io.IOException;
  
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.locator.AbstractCloudMetadataServiceConnector.DefaultCloudMetadataServiceConnector;
  import org.apache.cassandra.tcm.ClusterMetadataService;
  import org.apache.cassandra.tcm.StubClusterMetadataService;
  import org.apache.cassandra.utils.Pair;
  
  import static org.apache.cassandra.locator.AbstractCloudMetadataServiceConnector.METADATA_URL_PROPERTY;
  import static org.junit.Assert.assertEquals;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.doReturn;
  import static org.mockito.Mockito.spy;
  
  public class CloudstackSnitchTest
  {
      private static String az;
  
      @BeforeClass
      public static void setup() throws Exception
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @Before
      public void resetCMS()
      {
          ClusterMetadataService.unsetInstance();
          ClusterMetadataService.setInstance(StubClusterMetadataService.forTesting());
      }
  
      @Test
      public void testRacks() throws IOException, ConfigurationException
      {
          az = "ch-gva-1";
  
          DefaultCloudMetadataServiceConnector spiedConnector = spy(new DefaultCloudMetadataServiceConnector(
          new SnitchProperties(Pair.create(METADATA_URL_PROPERTY, "http://127.0.0.1"))));
  
          doReturn(az).when(spiedConnector).apiCall(any());
  
          // for registering a new node, location is obtained from the cloud metadata service
          CloudstackLocationProvider locationProvider = new CloudstackLocationProvider(spiedConnector);
          assertEquals("ch-gva", locationProvider.initialLocation().datacenter);
          assertEquals("1", locationProvider.initialLocation().rack);
  
          CloudstackSnitch snitch = new CloudstackSnitch(spiedConnector);
          assertEquals("ch-gva", snitch.getLocalDatacenter());
          assertEquals("1", snitch.getLocalRack());
      }
  
      @Test
      public void testNewRegions() throws IOException, ConfigurationException
      {
          az = "us-east-1a";
  
          DefaultCloudMetadataServiceConnector spiedConnector = spy(new DefaultCloudMetadataServiceConnector(
          new SnitchProperties(Pair.create(METADATA_URL_PROPERTY, "http://127.0.0.1"))));
  
          doReturn(az).when(spiedConnector).apiCall(any());
  
          // for registering a new node, location is obtained from the cloud metadata service
          CloudstackLocationProvider locationProvider = new CloudstackLocationProvider(spiedConnector);
          assertEquals("us-east", locationProvider.initialLocation().datacenter);
          assertEquals("1a", locationProvider.initialLocation().rack);
  
          CloudstackSnitch snitch = new CloudstackSnitch(spiedConnector);
          assertEquals("us-east", snitch.getLocalDatacenter());
          assertEquals("1a", snitch.getLocalRack());
      }
  }
  