code: package net.openhft.chronicle.map;
  
  import net.openhft.chronicle.core.Jvm;
  import org.junit.AfterClass;
  import org.junit.Assert;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import java.io.File;
  import java.io.IOException;
  
  public class AutoResizeTest {
  
      @BeforeClass
      public static void setup() {
          Jvm.setExceptionHandlers(null, null, null);
      }
  
      @AfterClass
      public static void reset() {
          Jvm.resetExceptionHandlers();
      }
  
      /**
       * test that the auto resizes are not zero upon a restart
       *
       * @throws IOException IOException
       */
      @Test
      public void testAutoResizeNotZeroUponRestart() throws IOException {
  
          File cmap = File.createTempFile("chron", "cmap");
  
          try (ChronicleMap<String, String> map = ChronicleMapBuilder
                  .of(String.class, String.class)
                  .averageKeySize(10).averageValueSize(10)
                  .entries(100).actualSegments(10).maxBloatFactor(10).replication((byte) 1)
                  .createOrRecoverPersistedTo(cmap)) {
  
              int actual = map.remainingAutoResizes();
              Assert.assertNotEquals(0, actual);
          }
  
          // if the file already exists  it will reuse the existing settings, set above
  
          try (ChronicleMap<String, String> map = ChronicleMapBuilder
                  .of(String.class, String.class)
                  .createOrRecoverPersistedTo(cmap)) {
              int actual = map.remainingAutoResizes();
              Assert.assertNotEquals(0, actual);
          }
      }
  
      @Test
      public void testAutoResizeNotZeroUponRestart2() {
  
          try (ChronicleMap<String, String> map = ChronicleMapBuilder
                  .of(String.class, String.class)
                  .averageKeySize(10).averageValueSize(10)
                  .entries(100).actualSegments(10).maxBloatFactor(10).replication((byte) 1)
                  .create()) {
  
              int actual = map.remainingAutoResizes();
              Assert.assertNotEquals(0, actual);
          }
      }
  }
  