Function test_server_with_worlds_and_config 

pub async fn test_server_with_worlds_and_config(
    default_domain: String,
    domains: &[ResolvedDomainConfig],
    loaded_worlds: &[Arc<World>],
    player_permission_states: PermissionSubjectIndex,
    config: Arc<RuntimeConfig>,
) -> Result<Arc<Server>, String>

Builds a server around already loaded worlds without starting any server loops.

Used by Steel tests and by the Flint test adapter.