public void DeleteRelease() { var releaseService = new Mock <IReleaseBusinessLayer>(); releaseService.Setup(x => x.GetReleaseByID(1)) .Returns(testrelease); var controller = new ReleaseController(releaseService.Object); IHttpActionResult actionResult = controller.DeleteRelease(1); Assert.IsInstanceOfType(actionResult, typeof(OkNegotiatedContentResult <Release>)); }