Mapper not initialized , error with my unit test Core.Net 2.0

Question

I have a WebApi done in Core.net 2.0, with UOW , and automapper. Everything is working fine, but now I want to implement Unit Test with Nunit, and I have this error of automapper

Message: System.InvalidOperationException : Mapper not initialized. Call Initialize with appropriate configuration. If you are trying to use mapper instances through a container or otherwise, make sure you do not have any calls to the static Mapper.Map methods, and if you're using ProjectTo or UseAsDataSource extension methods, make sure you pass in the appropriate IConfigurationProvider instance.

How can I solve this. Thanks in advance . Jolynice

Class AutoMapperProfile.cs

public class AutoMapperProfile : Profile
{
    public AutoMapperProfile()
    {
        CreateMap<Cars, CarsDTO>()
            .ReverseMap();
    }
}

class Startup.cs

public class Startup
{
    public IConfiguration Configuration { get; }

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }
    public void ConfigureServices(IServiceCollection services)
    {

        //removed configurations 

        // Add cors
        services.AddCors();

        // Add framework services.
        services.AddMvc();

        Mapper.Initialize(cfg =>
        {
            cfg.AddProfile<AutoMapperProfile>();
        });

        // Repositories
        services.AddScoped<IUnitOfWork, HttpUnitOfWork>();
        services.AddScoped<IAccountManager, AccountManager>();
    }
}

class carsController.cs

[Authorize]
[Route("api/[controller]")]
public class CarsController : Controller
{
private IUnitOfWork _unitOfWork;
readonly ILogger _logger;
private readonly IAccountManager _accountManager;

public CarsController(
    IUnitOfWork unitOfWork,
    ILogger<CarsController> logger, 
    IAccountManager accountManager)
{
    _unitOfWork = unitOfWork;
    _logger = logger;
    _accountManager = accountManager;
}


[HttpGet]
public IActionResult GetAll()
{
    var allCars = _unitOfWork.CarsRepository.GetAllCarsData();
    if (allCars == null)
    {
        return NotFound();
    }
    return Ok(Mapper.Map<IEnumerable<CarsDTO>>(allCars));
}

and this is my unit test

[TestFixture]
public class CarsControllerTest
{
#region private variables
List<Cars> cars = new List<Cars>();

CarsController _carsController = null;
IUnitOfWork _unitOfWork;
ICarsRepository _carsRepository;
#endregion


[SetUp]
public void SetUp()
{
    cars = new List<Cars>
    {
     new Cars
    {
        Alias = "406Moq",
        BrandId = 1,
        ModelId = 1,
        Plate = "00-00-01",
        AltranVehicle = 0,
        DefaultCar = 0,
        Active = 1,
        ColorId = 1
    }
    };
}


[Test]
public void GetAllCarsControllerTest()
{
    //Arrange
    _carsRepository = SetupCarsRepository();
    var unityOfWork = new Mock<IUnitOfWork>();
    var _logger = new Mock<ILogger<CarsController>>();
    var accountManager = new Mock<IAccountManager>();

    unityOfWork.SetupGet(c => c.CarsRepository).Returns(_carsRepository);
    _unitOfWork = unityOfWork.Object;

    _carsController = new CarsController(_unitOfWork, _logger.Object, accountManager.Object);


    //Act
    var carsResult = _carsController.GetAll();

    //Assert
    carsResult.StatusCode.Should().Be(HttpStatusCode.OK);
}

private ICarsRepository SetupCarsRepository()
{
    //initialize  repository
    var mockRepo = new Mock<ICarsRepository>(MockBehavior.Default);

    //Setup mocking behavior
    mockRepo.Setup(c => c.GetAllCarsData()).Returns(cars);

    return mockRepo.Object;
}

//Cleanup
[TearDown]
public void TearDown()
{
    cars = null;
}
}
}

Answer 1

You are missing initialization of your mapper in your unit test. The following initializes the mapper in the CarsControllerTest class constructor.

[TestFixture]
public class CarsControllerTest
{
    public CarsControllerTest()
    {
        Mapper.Initialize(cfg =>
        {
            cfg.AddProfile<AutoMapperProfile>();
        });
    }
}