@Test
public void testAddKnownAbsent() {

	// Add elements
	set.add((short)1);
	set.add((short)2);
	set.add((short)3);
	// Add a known absent element
	set.addKnownAbsent((short)4);
	// Verify that it was added
	assertEquals(4, set.size());
	assertEquals("{1, 2, 3, 4}", set.toString());
}