public void when_campaign_has_been_sent_then_show_error()
{
int campaignId = 88;
var campaignService = new Mock<ICampaignService>();
campaignService.Expect(cs => cs.RetrieveById(campaignId)).Returns(new CampaignBuilder().WithId(campaignId).WithSent(DateTime.Now).Build());
var controller = new CampaignController(campaignService.Object, null, null, null, null, null);
var result = (RedirectToRouteResult)controller.Send(campaignId);
AssertRedirectToRoute(result, "Preview");
Assert.AreEqual(88, result.RouteValues["campaignId"]);
}