### Question:
CorrelationKeySet implements Serializable { public boolean containsAll(CorrelationKeySet c) { Iterator<CorrelationKey> e = c.iterator(); while (e.hasNext()) if (!contains(e.next())) return false; return true; } CorrelationKeySet();  CorrelationKeySet(String canonicalForm); CorrelationKeySet add(CorrelationKey ck); boolean isOpaque(); boolean isRoutableTo(CorrelationKeySet candidateKeySet, boolean isAllRoute); boolean containsAll(CorrelationKeySet c); boolean isEmpty(); boolean contains(CorrelationKey correlationKey); Iterator<CorrelationKey> iterator(); void clear(); @Override int hashCode(); @Override boolean equals(Object o); List<CorrelationKeySet> findSubSets(); String toCanonicalString(); @Override String toString(); void restore(String canonicalForm); final static String VERSION_1; final static String VERSION_2; }### Answer:
@Test public void testContainsAll() throws Exception { CorrelationKeySet setA = new CorrelationKeySet(); CorrelationKeySet setB = new CorrelationKeySet(); assertTrue(setA.containsAll(setB)); setA.add(keyX); assertTrue(setA.containsAll(setB)); setB.add(keyY); assertFalse(setA.containsAll(setB)); setA.clear(); setA.add(keyY); assertTrue(setA.containsAll(setB)); }