public void AddCarFunction()
{
// Arrange:
var okCar = _data.okCar;
CarViewModel invalidCar = null;
// Act:
var okResponse = _carController.AddCarFunction(okCar);
CreatedAtActionResult okResult = okResponse as CreatedAtActionResult;
var badResponse = _carController.AddCarFunction(invalidCar);
BadRequestResult badResult = badResponse as BadRequestResult;
var invalidModelStateResponse = _carController.AddCarFunction(invalidCar);
StatusCodeResult badStatus = invalidModelStateResponse as StatusCodeResult;
// Assert:
Assert.IsInstanceOfType(okResponse, typeof(CreatedAtActionResult));
Assert.IsInstanceOfType(badResponse, typeof(BadRequestResult));
Assert.IsInstanceOfType(badResponse, typeof(StatusCodeResult));
}