public static void testLeftMembers2() { final Address a = Util.createRandomAddress(), b = Util.createRandomAddress(), c = Util.createRandomAddress(), d = Util.createRandomAddress(); List<Address> v1 = new ArrayList<>(); v1.add(a); v1.add(b); v1.add(c); v1.add(d); List<Address> v2 = new ArrayList<>(); v2.add(c); v2.add(d); v2.add(a); v2.add(b); View one = new View(new ViewId(a, 1), v1), two = new View(new ViewId(b, 2), v2); List<Address> left = View.leftMembers(one, two); System.out.println("left = " + left); assert left != null; assert left.isEmpty(); }