public void UpdateRelease() { var releaseService = new Mock <IReleaseBusinessLayer>(); releaseService.Setup(x => x.GetReleaseByID(1)).Returns(testrelease); var controller = new ReleaseController(releaseService.Object); IHttpActionResult actionResult = controller.UpdateRelease(1, testrelease); var contentResult = actionResult as OkNegotiatedContentResult <Release>; Assert.IsNotNull(contentResult.Content); Assert.AreEqual(1, contentResult.Content.ReleaseID); }