@Test public void testAddAll() { IntDoubleLinkedSet set2 = new IntDoubleLinkedSet(); set2.add(1, 2); set.add(0, 1); assertEquals(1, set.addAll(set2)); assertEquals(0, set.addAll(set2)); assertEquals(3, set.size()); assertSortedListEquals(set.toArray(), 0, 1, 2); }