CookieCollection implements Collection<Cookie> { @Override public int size() { return cookieMap.size(); } 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 size() throws Exception { CookieCollection cookies = new CookieCollection(); Assert.assertEquals(0, cookies.size()); cookies.add(cookie); Assert.assertEquals(1, cookies.size()); }