code: /*
   * Copyright 2018 Mitsunori Komatsu (komamitsu)
   *
   * Licensed 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.komamitsu.fluency.fluentd.ingester.sender.retry;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class ExponentialBackOffRetryStrategyTest
  {
      @Test
      void testGetNextIntervalMillis()
      {
          ExponentialBackOffRetryStrategy.Config config = new ExponentialBackOffRetryStrategy.Config();
          config.setBaseIntervalMillis(400);
          config.setMaxIntervalMillis(30000);
          config.setMaxRetryCount(7);
          RetryStrategy strategy = new ExponentialBackOffRetryStrategy(config);
  
          assertEquals(400, strategy.getNextIntervalMillis(0));
          assertEquals(800, strategy.getNextIntervalMillis(1));
          assertEquals(1600, strategy.getNextIntervalMillis(2));
          assertEquals(3200, strategy.getNextIntervalMillis(3));
          assertEquals(25600, strategy.getNextIntervalMillis(6));
          assertEquals(30000, strategy.getNextIntervalMillis(7));
          assertFalse(strategy.isRetriedOver(7));
          assertEquals(30000, strategy.getNextIntervalMillis(8));
          assertTrue(strategy.isRetriedOver(8));
      }
  
      @Test
      void validateConfig()
      {
          {
              ExponentialBackOffRetryStrategy.Config config = new ExponentialBackOffRetryStrategy.Config();
              config.setMaxRetryCount(-1);
              assertThrows(IllegalArgumentException.class, () -> new ExponentialBackOffRetryStrategy(config));
          }
  
          {
              ExponentialBackOffRetryStrategy.Config config = new ExponentialBackOffRetryStrategy.Config();
              config.setBaseIntervalMillis(9);
              assertThrows(IllegalArgumentException.class, () -> new ExponentialBackOffRetryStrategy(config));
          }
  
          {
              ExponentialBackOffRetryStrategy.Config config = new ExponentialBackOffRetryStrategy.Config();
              config.setMaxIntervalMillis(9);
              assertThrows(IllegalArgumentException.class, () -> new ExponentialBackOffRetryStrategy(config));
          }
      }
  }