-spec add_module(module()) -> ok | {error, term()}.

-spec distribute_modules(node()) -> [{module(), ok | {error, term()}}].

-spec does_scenario_exist(module()) -> boolean().

-spec handle_call(any(), any(), state()) -> {reply, any(), state()}.

-spec handle_cast(any(), state()) -> {noreply, state()}.

-spec init([]) -> {ok, state()}.

-spec list_configurable_modules() -> [module()].

-spec list_scenario_modules() -> [module()].

-spec start_link() -> {ok, pid()} | ignore | {error, term()}.