content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * 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
   *
   * https://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.agrona.concurrent;
  
  import org.junit.jupiter.api.Test;
  
  import static java.util.concurrent.TimeUnit.NANOSECONDS;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.greaterThanOrEqualTo;
  import static org.hamcrest.Matchers.lessThanOrEqualTo;
  
  class OffsetEpochNanoClockTest
  {
      @Test
      void shouldFindSaneEpochTimestamp()
      {
          final OffsetEpochNanoClock clock = new OffsetEpochNanoClock();
  
          assertSaneEpochTimestamp(clock);
      }
  
      private void assertSaneEpochTimestamp(final OffsetEpochNanoClock clock)
      {
          final long beginMs = System.currentTimeMillis();
          sleep();
  
          final long nanoTime = clock.nanoTime();
          final long timeMs = NANOSECONDS.toMillis(nanoTime);
  
          sleep();
          final long endMs = System.currentTimeMillis();
  
          assertThat(timeMs, greaterThanOrEqualTo(beginMs));
          assertThat(timeMs, lessThanOrEqualTo(endMs));
      }
  
      @Test
      void shouldResampleSaneEpochTimestamp()
      {
          final OffsetEpochNanoClock clock = new OffsetEpochNanoClock();
  
          clock.sample();
  
          assertSaneEpochTimestamp(clock);
      }
  
      private void sleep()
      {
          try
          {
              Thread.sleep(1);
          }
          catch (final InterruptedException ignore)
          {
              Thread.currentThread().interrupt();
          }
      }
  }
  