CookieCollection implements Collection<Cookie> { @Override public boolean containsAll(Collection<?> collection) { for(Object o : collection) { if(!contains(o)) { return false; } } return true; } CookieCollection();  CookieCollection(Cookie... cookies);  CookieCollection(Collection<? extends Cookie> cookies); @Override int size(); @Override boolean isEmpty(); @Override boolean contains(Object o); @Override Iterator<Cookie> iterator(); Cookie [] toArray(); @Override T[] toArray(T[] ts); @Override boolean add(Cookie cookie); @Override boolean remove(Object o); Cookie get(String name); @Override boolean containsAll(Collection<?> collection); @Override boolean addAll(Collection<? extends Cookie> collection); @Override boolean removeAll(Collection<?> collection); @Override boolean retainAll(Collection<?> collection); @Override void clear();  }
@Test public void containsAll() throws Exception { List<Cookie> content = Arrays.asList(cookie, brownieCookie); CookieCollection cookies = new CookieCollection(content); Assert.assertTrue(cookies.containsAll(content)); Assert.assertTrue(cookies.containsAll(Collections.singletonList(cookie))); Assert.assertFalse(cookies.containsAll(Arrays.asList(cookie, brownieCookie, cupsCookie))); Assert.assertTrue(cookies.containsAll(Arrays.asList(COOKIE_NAME, BROWNIE_NAME))); }