assertArrayEquals(new Integer[] { 1, 2 }, ArrayUtil.asArray(1, 2));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testAddAll() throws Exception {
        final String[] array = new String[] { "111" };
        final String[] newArray = ArrayUtil.add(array, "222");
        assertThat(newArray.length, is(2));
        assertThat(newArray[0], is("111"));

    assertEquals(Range.closed(7, 10), rangeSet.rangeContaining(8));
    assertTrue(rangeSet.contains(8));
    assertNull(rangeSet.rangeContaining(6));
    assertFalse(rangeSet.contains(6));
  }

  public void testAddAll() {
    RangeSet<Integer> rangeSet = TreeRangeSet.create();
    rangeSet.add(Range.closed(3, 10));
    rangeSet.addAll(Arrays.asList(Range.open(1, 3), Range.closed(5, 8), Range.closed(9, 11)));