public void Update_UnknownGuidPassed_ReturnsNotFoundResult() { // Arrange var nameMissingItem = new SubjectModel() { Id = 50, Credits = 3, TeacherId = 1 }; // Act var notFoundResult = studentsController.PutSubject(nameMissingItem.Id, nameMissingItem).Result; // Assert Assert.IsType <NotFoundResult>(notFoundResult); }