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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.ambari.server.checks;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.ambari.server.orm.entities.RepositoryVersionEntity;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Clusters;
  import org.apache.ambari.server.state.Host;
  import org.apache.ambari.server.state.HostHealthStatus;
  import org.apache.ambari.server.state.HostHealthStatus.HealthStatus;
  import org.apache.ambari.server.state.MaintenanceState;
  import org.apache.ambari.server.state.StackId;
  import org.apache.ambari.spi.ClusterInformation;
  import org.apache.ambari.spi.RepositoryType;
  import org.apache.ambari.spi.upgrade.UpgradeCheckRequest;
  import org.apache.ambari.spi.upgrade.UpgradeCheckResult;
  import org.apache.ambari.spi.upgrade.UpgradeCheckStatus;
  import org.apache.ambari.spi.upgrade.UpgradeType;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.Mockito;
  
  import com.google.inject.Provider;
  
  /**
   * Unit tests for HostsHeartbeatCheck
   *
   */
  public class HostsHeartbeatCheckTest {
    private final Clusters clusters = Mockito.mock(Clusters.class);
  
    final RepositoryVersionEntity m_repositoryVersion = Mockito.mock(RepositoryVersionEntity.class);
  
    /**
     *
     */
    @Before
    public void setup() throws Exception {
      Mockito.when(m_repositoryVersion.getType()).thenReturn(RepositoryType.STANDARD);
      Mockito.when(m_repositoryVersion.getVersion()).thenReturn("2.2.0.0-1234");
      Mockito.when(m_repositoryVersion.getStackId()).thenReturn(new StackId("HDP", "2.2"));
    }
  
    /**
     * @throws Exception
     */
    @Test
    public void testPerform() throws Exception {
      final HostsHeartbeatCheck hostHeartbeatCheck = new HostsHeartbeatCheck();
      hostHeartbeatCheck.clustersProvider = new Provider<Clusters>() {
  
        @Override
        public Clusters get() {
          return clusters;
        }
      };
  
      final Cluster cluster = Mockito.mock(Cluster.class);
      Mockito.when(cluster.getClusterId()).thenReturn(1L);
      Mockito.when(cluster.getCurrentStackVersion()).thenReturn(new StackId("HDP", "2.2"));
      Mockito.when(clusters.getCluster("cluster")).thenReturn(cluster);
  
      final List<Host> hosts = new ArrayList<>();
      final Host host1 = Mockito.mock(Host.class);
      final Host host2 = Mockito.mock(Host.class);
      final Host host3 = Mockito.mock(Host.class);
  
      final HostHealthStatus status1 = Mockito.mock(HostHealthStatus.class);
      final HostHealthStatus status2 = Mockito.mock(HostHealthStatus.class);
      final HostHealthStatus status3 = Mockito.mock(HostHealthStatus.class);
  
      Mockito.when(host1.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host2.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
  
      Mockito.when(host1.getHealthStatus()).thenReturn(status1);
      Mockito.when(host2.getHealthStatus()).thenReturn(status2);
      Mockito.when(host3.getHealthStatus()).thenReturn(status3);
  
      Mockito.when(status1.getHealthStatus()).thenReturn(HealthStatus.HEALTHY);
      Mockito.when(status2.getHealthStatus()).thenReturn(HealthStatus.HEALTHY);
      Mockito.when(status3.getHealthStatus()).thenReturn(HealthStatus.UNKNOWN);
  
      hosts.add(host1);
      hosts.add(host2);
      hosts.add(host3);
  
      Mockito.when(cluster.getHosts()).thenReturn(hosts);
  
      ClusterInformation clusterInformation = new ClusterInformation("cluster", false, null, null, null);
      UpgradeCheckRequest request = new UpgradeCheckRequest(clusterInformation, UpgradeType.ROLLING, null, null, null);
  
      UpgradeCheckResult check = hostHeartbeatCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.FAIL, check.getStatus());
      Assert.assertFalse(check.getFailedDetail().isEmpty());
  
      // put the unhealthy host into MM which will allow this check to pass
      check = new UpgradeCheckResult(null, null);
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.ON);
      check = hostHeartbeatCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.PASS, check.getStatus());
      Assert.assertTrue(check.getFailedDetail().isEmpty());
  
      // make the host healthy and take it out of MM to produce a PASS result
      Mockito.when(status3.getHealthStatus()).thenReturn(HealthStatus.HEALTHY);
      check = new UpgradeCheckResult(null, null);
      Mockito.when(host3.getMaintenanceState(1L)).thenReturn(MaintenanceState.OFF);
      check =hostHeartbeatCheck.perform(request);
      Assert.assertEquals(UpgradeCheckStatus.PASS, check.getStatus());
      Assert.assertTrue(check.getFailedDetail().isEmpty());
    }
  }
  