public void GetReleases() { var releaseService = new Mock <IReleaseBusinessLayer>(); releaseService.Setup(x => x.GetReleases()).Returns(new List <Release>()); var controller = new ReleaseController(releaseService.Object); IHttpActionResult actionResult = controller.GetReleases(); var contentResult = actionResult as OkNegotiatedContentResult <List <Release> >; Assert.IsNotNull(contentResult.Content); }