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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 com.datastax.oss.driver.internal.core.loadbalancing;
  
  import static com.datastax.oss.driver.api.core.config.DriverExecutionProfile.DEFAULT_NAME;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.Mockito.spy;
  import static org.mockito.Mockito.when;
  
  import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
  import java.util.Map;
  import java.util.UUID;
  import org.junit.runner.RunWith;
  import org.mockito.junit.MockitoJUnitRunner;
  
  // TODO fix unnecessary stubbing of config option in parent class (and stop using "silent" runner)
  @RunWith(MockitoJUnitRunner.Silent.class)
  public class DefaultLoadBalancingPolicyDcFailoverTest
      extends BasicLoadBalancingPolicyDcFailoverTest {
  
    @Override
    protected DefaultLoadBalancingPolicy createAndInitPolicy() {
      when(node4.getDatacenter()).thenReturn("dc2");
      when(node5.getDatacenter()).thenReturn("dc2");
      when(node6.getDatacenter()).thenReturn("dc2");
      when(node7.getDatacenter()).thenReturn("dc3");
      when(node8.getDatacenter()).thenReturn("dc3");
      when(node9.getDatacenter()).thenReturn("dc3");
      // Accept 2 nodes per remote DC
      when(defaultProfile.getInt(
              DefaultDriverOption.LOAD_BALANCING_DC_FAILOVER_MAX_NODES_PER_REMOTE_DC))
          .thenReturn(2);
      when(defaultProfile.getBoolean(
              DefaultDriverOption.LOAD_BALANCING_DC_FAILOVER_ALLOW_FOR_LOCAL_CONSISTENCY_LEVELS))
          .thenReturn(false);
      // Use a subclass to disable shuffling, we just spy to make sure that the shuffling method was
      // called (makes tests easier)
      DefaultLoadBalancingPolicy policy =
          spy(
              new DefaultLoadBalancingPolicy(context, DEFAULT_NAME) {
                @Override
                protected void shuffleHead(Object[] array, int n) {}
              });
      Map<UUID, Node> nodes =
          ImmutableMap.<UUID, Node>builder()
              .put(UUID.randomUUID(), node1)
              .put(UUID.randomUUID(), node2)
              .put(UUID.randomUUID(), node3)
              .put(UUID.randomUUID(), node4)
              .put(UUID.randomUUID(), node5)
              .put(UUID.randomUUID(), node6)
              .put(UUID.randomUUID(), node7)
              .put(UUID.randomUUID(), node8)
              .put(UUID.randomUUID(), node9)
              .build();
      policy.init(nodes, distanceReporter);
      assertThat(policy.getLiveNodes().dc("dc1")).containsExactly(node1, node2, node3);
      assertThat(policy.getLiveNodes().dc("dc2")).containsExactly(node4, node5); // only 2 allowed
      assertThat(policy.getLiveNodes().dc("dc3")).containsExactly(node7, node8); // only 2 allowed
      return policy;
    }
  }
  