@Test
public void testFormat() {

	List<String> list = Arrays.asList( "1", "2", "", "3", "4" );
	Assert.assertEquals( "1, 2, , 3, 4", Utils.format( list, ", " ));
	Assert.assertEquals( "1 - 2 -  - 3 - 4", Utils.format( list, " - " ));
}