@Override
    public boolean containsAll(Collection c) {
        for (Object o : c) {
            if (!contains(o)) return false;
        }
        return true;
    }
@Test
    public void testContainsAll() {
        Uuid fooUuid = Uuid.randomUuid();
        Uuid barUuid = Uuid.randomUuid();
        Uuid bazUuid = Uuid.randomUuid();
        Uuid quxUuid = Uuid.randomUuid();
        TopicsImage topicsImage = new MetadataImageBuilder()
            .addTopic(fooUuid, "foo", 3)
            .addTopic(barUuid, "bar", 3)
            .addTopic(bazUuid, "baz", 3)
            .addTopic(quxUuid, "qux", 3)
            .build()
            .topics();

        Set<Uuid> topicIds = new TopicIds(mkSet("foo", "bar", "baz", "qux"), topicsImage);

        assertTrue(topicIds.contains(fooUuid));
        assertTrue(topicIds.contains(barUuid));
        assertTrue(topicIds.contains(bazUuid));
        assertTrue(topicIds.contains(quxUuid));
        assertTrue(topicIds.containsAll(mkSet(fooUuid, barUuid, bazUuid, quxUuid)));
    }