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);
        }