content: package com.taobao.arthas.core.util;
  
  import org.junit.Assert;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  
  /**
   * @author earayu
   */
  public class ArrayUtilsTest {
  
      @Rule
      public ExpectedException thrown = ExpectedException.none();
  
      @Test
      public void testEmptyLongArray() {
          Assert.assertArrayEquals(ArrayUtils.EMPTY_LONG_ARRAY, new long[0]);
      }
  
      @Test
      public void testToPrimitive() {
          Assert.assertArrayEquals(ArrayUtils.toPrimitive(null), null);
          Assert.assertArrayEquals(ArrayUtils.toPrimitive(new Long[0]), new long[0]);
          Assert.assertArrayEquals(
                  ArrayUtils.toPrimitive(new Long[]{
                          1L,
                          1763L,
                          54769975464L
                  }),
                  new long[]{
                          1L,
                          1763L,
                          54769975464L
                  });
          //throws NullPointerException if array content is null
          thrown.expect(NullPointerException.class);
          Assert.assertArrayEquals(ArrayUtils.toPrimitive(new Long[]{null}), new long[]{1L});
      }
  }
  