Improve test error ouput.

deps/rabbitmq_auth_backend_cache/src/rabbit_auth_cache_ets_segmented.erl

@@ -15,7 +15,7 @@
 %%
 
 -module(rabbit_auth_cache_ets_segmented).
--behaviour(gen_server2).
+-behaviour(gen_server).
 -behaviour(rabbit_auth_cache).
 
 -export([start_link/1,

deps/rabbitmq_auth_backend_cache/test/rabbit_auth_cache_SUITE.erl

@@ -166,7 +166,19 @@ random_timing(Config, MaxTTL, Parallel) ->
                     ok = AuthCacheModule:put(Key, Value, TTL),
                     case AuthCacheModule:get(Key) of
                         {ok, Value} -> ok;
-                        Other -> error({Other, Value})
+                        Other ->
+                            case AuthCacheModule of
+                                rabbit_auth_cache_ets_segmented ->
+                                    State = sys:get_state(AuthCacheModule),
+                                    Data = case State of
+                                        {state, Segments, _, _} when is_list(Segments) ->
+                                            [ets:tab2list(Segment) || {_, Segment} <- Segments];
+                                        _ -> []
+                                    end,
+                                    error({Other, Value, State, Data});
+                                _ ->
+                                    error({Other, Value})
+                            end
                     end,
                     % expiry error
                     timer:sleep(TTL + 40),