public void testContainsAll() {
MutableDigest digest=new MutableDigest(members);
digest.set(a1,1,1);
digest.set(a2,1,1);
assert digest.containsAll(a1, a2, a3);
digest.set(a3,1,1);
assert digest.containsAll(a1, a2, a3);
assert d.containsAll(a1, a2, a3);
}