How to test a custom AuthenticationStateProvider?

[TDroogers]

I have a page with the following code:

[Inject] private CustomStateProvider AuthenticationStateProvider { get; set; } = default!;
@code {
    ....
          var user = await AuthenticationStateProvider.GetAuthenticationStateAsync();
    ....
}

The CustomStateProvideris set in program.cs:

builder.Services.AddScoped<AuthenticationStateProvider>(s => s.GetRequiredService<CustomStateProvider>());

I'm gettin the following error: Cannot provide a value for property 'AuthenticationStateProvider' on type 'Drogecode.Knrm.Oefenrooster.Client.Shared.Layout.UpdateChecker'. There is no registered service of type 'Drogecode.Knrm.Oefenrooster.Client.Services.CustomStateProvider'.

I have set the test authorization with: var authContext = this.AddTestAuthorization();

Thanks!

[linkdotnet]

Hey @TDroogers

It seems you are missing the same registration you did in your Program.cs in the test setup. See: https://bunit.dev/docs/providing-input/inject-services-into-components.html#injecting-services-in-tests

[scottsauber]

Yep - that was my first thought as well is make sure you're registering that in your tests as well like Services.AddScoped<AuthenticationStateProvider, CustomStateProvider>(); if your class inherits the TestContext.

If you share your whole tests file, we could confirm that's what the issue is.

[TDroogers]

@linkdotnet Thanks for your response,

I already tried that, but I'm still getting that error.

The test
Initilization
The component I'm trying to test

[linkdotnet]

I am so blind:

[Inject] private CustomStateProvider AuthenticationStateProvider { get; set; } = default!;

This will ask for a CustomStateProvider but you didn't directly register one. You told the container only to provide CustomStateProvider if someone asks for a AuthenticationStateProvider.

That said, you can easily fix your issue by:

-[Inject] private CustomStateProvider AuthenticationStateProvider { get; set; } = default!;
+[Inject] private AuthenticationStateProvider AuthenticationStateProvider { get; set; } = default!;

Alternatively, you register CustomStateProvider additionally in the container:

Services.AddScoped<CustomStateProvider>();
Services.AddScoped<AuthenticationStateProvider>(c => c.GetRequiredService<CustomStateProvider>());

[TDroogers]

Thanks!