public void ItFormatsTheCookieExpirationDataAccordinglyToRfc2109() { var response = new Response(); response.SetCookie("foo", new Response.Cookie { Value = "bar", Expires = new DateTime(1971, 10, 14, 12, 34, 56) }); Assert.That(response.GetHeader("Set-Cookie"), Is.StringMatching(@"expires=..., \d\d-...-\d\d\d\d \d\d:\d\d:\d\d ...")); }