public void AddCookies_WithValidCookies_Successfully() { driver.Navigate().GoToUrl("https://www.google.com/"); var cookiesBefore = driver.GetAllCookies(); Cookie cookie = new Cookie("test", "test"); List <Cookie> cookies = new List <Cookie>(); cookies.Add(cookie); driver.AddCookies(cookies); var cookiesAfter = driver.GetAllCookies(); cookiesBefore.Count.AreLessThan(cookiesAfter.Count); }