public async Task DeleteTruck_Exists_ReturnsOk()
{
// create model
var model = new Model();
model.Description = Guid.NewGuid().ToString();
IActionResult actionResult = await _modelController.PostModel(model);
var modelCreatedResult = actionResult as CreatedAtActionResult;
Assert.IsNotNull(modelCreatedResult);
Assert.AreEqual(201, modelCreatedResult.StatusCode);
model.ModelId = Convert.ToInt32(modelCreatedResult.RouteValues["id"]);
// create truck
var truck = new Truck();
truck.Chassis = Guid.NewGuid().ToString();
truck.Year = Convert.ToInt16(new Random().Next(1900, 2019));
truck.Model = model;
actionResult = await _truckController.PostTruck(truck);
var createdResult = actionResult as CreatedAtActionResult;
Assert.IsNotNull(createdResult);
Assert.AreEqual(201, createdResult.StatusCode);
// delete truck
actionResult = await _truckController.DeleteTruck(truck.TruckId);
var okResult = actionResult as OkObjectResult;
Assert.IsNotNull(okResult);
Assert.AreEqual(200, okResult.StatusCode);
Assert.Pass();
}