Autofac registration xUnit tests

AutofacRegistration_Tests.cs

public class AutofacRegistration_Tests  
{
    [Fact]
    public void any_type_in_service_layer_should_NOT_be_registered_as_InstancePerRequest()
    {
        var containerRegistrations = GetContainer().ComponentRegistry.Registrations;
        var results = containerRegistrations.ToDictionary(reg => reg, IsRegistrationScopeInstancePerRequest);

        /* When test fails, debug this test and run following command in `Immediate console`: 
         * var invalid = results.Where(r=>r.Value);
         * Then look into your `Local variables` window for new variable named "invalid".
         * It contains all invalid registrations.
         */

#if DEBUG
        foreach (var registration in results.Where(result => result.Value).Select(result => result.Key))
        {
            Debug.WriteLine($"Type {registration.Activator} is registered with invalid scope.");
        }
#endif

        results
            .Where(result => result.Value)
            .Select(result => result.Key)
            .ShouldBeEmpty();
    }

    private static bool IsRegistrationScopeInstancePerRequest(IComponentRegistration registration)
    {
        if (registration.Lifetime.GetType() != typeof(MatchingScopeLifetime))
            return false;

        // ReSharper disable once PossibleNullReferenceException
        var tags = typeof(MatchingScopeLifetime)
            .GetField("_tagsToMatch", BindingFlags.NonPublic | BindingFlags.Instance)
            .GetValue(registration.Lifetime) as object[];

        return tags != null && tags.Any(tag => tag == MatchingScopeLifetimeTags.RequestLifetimeScopeTag);
    }

    private IContainer GetContainer()
    {
        ...
    }
}