@Test
public void testCalculateRanges_multi() {

    final List<String> result = Utils.calculateRanges(
        Arrays.asList(0,1,3,4,6)
    );
    assertEquals(3, result.size());
    assertEquals("0-1", result.get(0));
    assertEquals("3-4", result.get(1));
    assertEquals("6", result.get(2));
}