Dependency Injection with XUnit and ASP.NET Core 1.0

Question

I am trying to figure out how I can use dependency injection with XUnit. My goal is to be able to inject my ProductRepository into my test class.

Here is the code I am trying:

public class DatabaseFixture : IDisposable
{
    private readonly TestServer _server;

    public DatabaseFixture()
    {
        _server = new TestServer(TestServer.CreateBuilder().UseStartup<Startup>());
    }

    public void Dispose()
    {
        // ... clean up test data from the database ...
    }
}

public class MyTests : IClassFixture<DatabaseFixture>
{
    DatabaseFixture _fixture;
    public ICustomerRepository _repository { get; set; }

    public MyTests(DatabaseFixture fixture, ICustomerRepository repository)
    {
        _fixture = fixture;
        _repository = repository;
    }
}

Here is the error: The following constructor parameters did not have matching fixture data (ICustomerRepository repository)

This leads me to believe that XUnit doens't support dependency injection, only if it is a Fixture.

Can someone give me a way of getting an instance of ProductRepository in my test class using XUnit? I believe I am correctly starting up a test server so Startup.cs runs and configures the DI.

Try this xunit di support built into xunit framework: nuget.org/packages/Xunit.Di, so that you can inject services dependencies the same way as you do for any other applications. — cli
– cli, Commented Oct 3, 2021 at 12:05

Community · Accepted Answer · 2020-06-20 09:12:55Z

7

Well, I don't think it is possible to access the container of the SUT. And to be honest I don't exactly understand why you'd want to. You will want complete control of your SUT. That means you want to provide your own dependencies to inject.

And that, you can!

_server = new TestServer(TestServer.CreateBuilder(null, app =>
{
    app.UsePrimeCheckerMiddleware();
},
services =>
{
    services.AddSingleton<IPrimeService, NegativePrimeService>();
    services.AddSingleton<IPrimeCheckerOptions, PrimeCheckerOptions>();
}));

The CreateBuilder provides overloads for this. You'll need to provide configurations and app configurations for the same reasons (reason being you want complete control over your SUT). I followed this article to make the above example if you are interested. I could also upload the sample to my GitHub if you want?

Let me know if it helped.

Update GitHub sample: https://github.com/DannyvanderKraan/ASPNETCoreAndXUnit

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Mar 11, 2016 at 10:33

Danny van der Kraan

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3 Comments

Blake Rivell Over a year ago

Danny if you can upload an example to github that would be awesome. I'd have to admit that I am still a bit confused. Lets say I have a IProductRepo and a ProductRepo: Can you give me an example of the proper way to get an instance of ProductRepo using DI so I can use it in my test class?

Danny van der Kraan Over a year ago

Blake, i've updated my answer. What you would do is, instead of IPrimeService, you would write IProductRepo and instead of NegativePrimeService, you would write ProductRepo. Hope its clear now.

user11712184 Over a year ago

hi @DannyvanderKraan can you answer this question ? Thanks ! stackoverflow.com/questions/57331395/…

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