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   * "License"); you may not use this file except in compliance
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   *
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  package org.apache.cassandra.repair.autorepair;
  
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.metrics.AutoRepairMetrics;
  import org.apache.cassandra.metrics.AutoRepairMetricsManager;
  import org.apache.cassandra.repair.autorepair.AutoRepairConfig.RepairType;
  import org.apache.cassandra.repair.autorepair.AutoRepairUtils.RepairTurn;
  import org.apache.cassandra.service.AutoRepairService;
  import org.apache.cassandra.service.StorageService;
  
  import static org.apache.cassandra.Util.setAutoRepairEnabled;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class AutoRepairMetricsTest extends CQLTester
  {
  
      private AutoRepairMetrics metrics;
  
      @BeforeClass
      public static void setupClass() throws Exception
      {
          setAutoRepairEnabled(true);
          requireNetwork();
          AutoRepairUtils.setup();
          StorageService.instance.doAutoRepairSetup();
  
          // Set min repair interval to an hour.
          AutoRepairConfig config = AutoRepairService.instance.getAutoRepairConfig();
          config.setRepairMinInterval(RepairType.FULL, "1h");
      }
  
      @Before
      public void setup()
      {
          metrics = AutoRepairMetricsManager.getMetrics(RepairType.FULL);
      }
  
      @Test
      public void testShouldRecordRepairStartLagAndResetOnMyTurn()
      {
          // record a last finish repair time of one day.
          long oneDayAgo = AutoRepair.instance.currentTimeMs() - 86_400_000;
          metrics.recordRepairStartLag(oneDayAgo);
  
          // expect a recorded lag time of approximately 1 day (last repair finish time) - 1 hour (min repair interval)
          long expectedLag = 86400 - 3600;
          long recordedLag = metrics.repairStartLagSec.getValue();
          assertTrue(String.format("Expected at last 23h of lag (%d) but got (%d)", expectedLag, recordedLag),
                     recordedLag >= expectedLag);
          // Given timing, allow at most 5 seconds of skew.
          assertTrue(String.format("Expected 23h of lag (%d) but got a larger value (%d)", expectedLag, recordedLag),
                     recordedLag <= expectedLag + 5);
  
          // expect lag time to be restarted when recording a turn.
          metrics.recordTurn(RepairTurn.MY_TURN);
          assertEquals(0, metrics.repairStartLagSec.getValue().intValue());
      }
  
      @Test
      public void testShouldRecordRepairStartLagOfZeroWhenFinishTimeIsWithinMinRepairInterval()
      {
          // record a last finish repair time of one 30 minutes
          long thirtyMinutesAgo = AutoRepair.instance.currentTimeMs() - 1_800_000;
          metrics.recordRepairStartLag(thirtyMinutesAgo);
  
          // expect 0 lag because last repair finish time was less than min repair interval
          assertEquals(0, metrics.repairStartLagSec.getValue().intValue());
      }
  }
  