public void Should_add_caching_headers_for_not_caching()
{
var response = new Response();
var result = response.DoNotCache();
result.Headers.ShouldNotBeNull();
result.Headers["Cache-Control"].ShouldEqual("no-cache, no-store, must-revalidate");
result.Headers["Pragma"].ShouldEqual("no-cache");
var expires = result.Headers["Expires"];
expires.ShouldNotBeNull();
var expiresDate = DateTime.ParseExact(expires, "R", DateTimeFormatInfo.InvariantInfo);
(expiresDate <= DateTime.UtcNow.AddDays(-1)).ShouldBeTrue();
}