Why Do I Need Re-Registration Of Types After Adding Registrations To A Liftetime Scope In Autofac?

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Autofac

Hello

I have a type registered as IServiceA. The type is dependent upon another service IServiceB in its constructor. Both types registered using Autofac something like this:

public static void Configure(ContainerBuilder builder)
{
      builder.RegisterType<ServiceA>().As<IServiceA>();
      builder.RegisterType<ServiceB>().As<IServiceB>();
}

When doing integrationtests we need to inject a fake instead of the real IServiceB. For every test we do, we create a new Lifetime Scope and injects our fakes when this is created. This is the way we do that:

public ILifetimeScope CreateLiftetimeScope()
{
    lifetimeScope = Container.BeginLifetimeScope(p =>
    {
        foreach (var injectionAction in injectionActions)
        {
            injectionAction(p);
        }
    });

    return lifetimeScope;
}

Our problem is that for every time we create a fake for e.g. IServiceB we need to re-register IServiceA, otherwise it will use the old registration of IServiceB. Why is the new IServiceB not used by the old registrations of IServiceA? Are we doing something wrong here?