public void CookieExists_Exists_ThrowsNotImplementedException()
        {
            CookieManager.Add("myhost2", "b", "c", "d", true, true, true, long.MaxValue);
            var results = CookieManager.GetCookiesFromHost("myhost2");

            Assert.IsTrue(results.MoveNext());
            var cookie = results.Current;

            Assert.Throws <NotImplementedException>(() => CookieManager.CookieExists(cookie));
        }