= new Mock<ITweetService>(); _controller = new ConcertsController(_concertService.Object, _tweetService.Object); _request = new HttpRequestMessage(); _request.Headers.Add("app_id", "testapp"); _request.Headers.Add("user", "testuser"); _controller.Request = _request; _concertService.Setup(s => s.CreateConcert(It.IsAny<string>(), It.IsAny<Concert>())) .Returns(() => new CreateUpdateConcertResponse { RequestId = _requestId, Concert = ConcertTestData.GetCreatedConcert(), }); _tweetService.Setup(s => s.TweetConcert(It.IsAny<Concert>())) .Returns(() => _tweetUrl); _concert = ConcertTestData.GetConcertToCreate(); }