public async Task CanValidateModelFields_UpdateVehicle_RequiredFielsAreMissing()
{
SaveVehicleResource vehicleResource = new SaveVehicleResource {
Contact = null
};
_controller.ModelState.AddModelError("Contact", "The Contact Name field is required.");
IActionResult actual = await _controller.UpdateVehicleAsync(123, vehicleResource);
_vehiclesRepository.Verify(db => db.GetWithDependenciesAsync(It.IsAny <int>()), Times.Never);
_vehiclesRepository.Verify(db => db.IsModelExists(It.IsAny <int>()), Times.Never);
_vehiclesRepository.Verify(db => db.IsFeatureExists(It.IsAny <int>()), Times.Never);
Assert.IsInstanceOf <BadRequestObjectResult>(actual);
}