public void AddContact_WhenInvalidObjectPassed_ReturnsBadRequest() { var missingAddressContact = new Contact() { Name = "PartialContact", Email = "*****@*****.**", PhoneNumber = "11109873462", Dob = new DateTime(1965, 12, 1), }; _applicationController.ModelState.AddModelError("Address", "Required"); var response = _applicationController.AddContact(missingAddressContact); Assert.IsType <BadRequestObjectResult>(response); }