CookieCollection implements Collection<Cookie> { @Override public boolean removeAll(Collection<?> collection) { boolean result = false; for(Object cookie : collection) { result|= remove(cookie); } return result; } 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 removeAll() throws Exception { CookieCollection cookies = new CookieCollection(cookie, brownieCookie, cupsCookie); boolean modified = cookies.removeAll(Arrays.asList(brownieCookie, cupsCookie)); Assert.assertTrue(modified); Assert.assertEquals(1, cookies.size()); Assert.assertFalse(cookies.contains(brownieCookie)); Assert.assertFalse(cookies.contains(cupsCookie)); Assert.assertFalse(cookies.removeAll(Collections.EMPTY_LIST)); }