The following constructor parameters did not have

Question

I'm trying to test my controllers using xUnitbut getting the following error during execution of Customer Controller:

"The following constructor parameters did not have matching fixture data: CustomerController customerController"

Test Class

public class UnitTest1
{
    CustomerController _customerController;

    public UnitTest1(CustomerController customerController)
    {
        _customerController = customerController;
    }

    [Fact]
    public void PostTestSuccessful()
    {
        Guid guid = Guid.NewGuid();

        CustomerViewModel model = new CustomerViewModel()
        {
            Id = guid,
            Name = "testName",
            Email = "test email",
            PhoneNumber = "test phone",
            Address = "test address",
            City = "test city",
            Gender = "Male"
        };

        var actionResult = _customerController.Post(model);

        Assert.NotNull(actionResult);
        Assert.IsType<Task<IActionResult>>(actionResult);
        Assert.True(actionResult.IsCompletedSuccessfully);
    }

CustomerController Class

[Route("customers")]
public class CustomerController : ControllerBase
{
    private readonly ILogger _logger;
    private readonly ICustomerService _customerService;

    public CustomerController(ILogger<CustomerController> logger,
        ICustomerService customerService)
    {
        _logger = logger;
        _customerService = customerService;
    }

    [HttpPost]
    public async Task<IActionResult> Post([FromBody] CustomerViewModel viewModel)
    {
        var customerToBeSaved = viewModel.Adapt<CustomerServiceModel>();

        var customer = await _customerService.SaveAsync(customerToBeSaved);

        var result = customer.Adapt<CustomerViewModel>();

        return Ok(result);
    }

Answer 1

For the testing framework, you need the mocking library to inject a mock object through DI in your testing classes. You can use Nmock, Moq or any other mocking library to setup the constructor injection.

https://www.c-sharpcorner.com/uploadfile/john_charles/mocking-in-net-with-moq/

http://nmock.sourceforge.net/quickstart.html

Answer 2

This article shows how to get xunit working with .Net Core ASP.Net really well. It actually replaces the startup so that your controllers run in the same process, and you can test them as if they were local.

https://docs.microsoft.com/en-us/aspnet/core/test/integration-tests?view=aspnetcore-2.2

Answer 3

Just new up CustomerController in the constructor, if you don't want to use any mocking framework.