d.get("https://github.com/");
// Clear all cookies
assertTrue(d.manage().getCookies().size() > 0);
d.manage().deleteAllCookies();
assertEquals(d.manage().getCookies().size(), 0);
// All cookies deleted, call deleteAllCookies again. Should be a no-op.
d.manage().deleteAllCookies();
d.manage().deleteCookieNamed("non_existing_cookie");
assertEquals(d.manage().getCookies().size(), 0);