void () { JBIterable<Integer> it = JBIterable.of(1, 2, 3).append(JBIterable.of(4, 5, 6)).append(JBIterable.empty()).append(7); assertEquals(7, it.size()); assertEquals(Arrays.asList(1, 2, 3, 4, 5, 6, 7), it.toList()); assertTrue(it.contains(5)); }