BuildAuthorizationService - ASP.NET Core - Unit Testing Authorization Service - https://codingblast.com/asp-net-core-unit-testing-authorizationservice-inside-controller/

UnitTestController.cs

private IAuthorizationService BuildAuthorizationService(Action<IServiceCollection> setupServices = null)
{
    var services = new ServiceCollection();
    services.AddAuthorization();
    services.AddLogging();
    services.AddOptions();
    setupServices?.Invoke(services);
    return services.BuildServiceProvider().GetRequiredService<IAuthorizationService>();
}