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diff --git a/lib/diameter/test/diameter_stats_SUITE.erl b/lib/diameter/test/diameter_stats_SUITE.erl
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+++ b/lib/diameter/test/diameter_stats_SUITE.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2010-2011. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+%%
+%% Tests of the server implemented by diameter_stats.erl.
+%%
+
+-module(diameter_stats_SUITE).
+
+-export([suite/0,
+         all/0,
+         groups/0,
+         init_per_group/2,
+         end_per_group/2,
+         init_per_suite/1,
+         end_per_suite/1]).
+
+%% testcases
+-export([an/1,
+         twa/1]).
+
+-define(stat, diameter_stats).
+-define(util, diameter_util).
+
+%% ===========================================================================
+
+suite() ->
+    [{timetrap, {seconds, 10}}].
+
+all() ->
+    [{group, all} | tc()].
+
+groups() ->
+    [{all, [parallel], tc()}].
+
+tc() ->
+    [an,
+     twa].
+
+init_per_group(_, Config) ->
+    Config.
+
+end_per_group(_, _) ->
+    ok.
+
+init_per_suite(Config) ->
+    ok = diameter:start(),
+    Config.
+
+end_per_suite(_Config) ->
+    ok = diameter:stop().
+
+%% ===========================================================================
+
+an(_) ->
+    Ref = {'_', make_ref()},
+    true = ?stat:reg(Ref),
+    true = ?stat:reg(Ref),  %% duplicate
+    ok = ?stat:incr(x),
+    ok = ?stat:incr(x, Ref),
+    ok = ?stat:incr(y, 2),
+    ok = ?stat:incr(y, Ref),
+    %% Flushing a pid flushes even stats on the registered reference.
+    [{x,2},{y,3}] = lists:sort(?stat:flush()),
+    [] = ?stat:flush(Ref),
+    [] = ?stat:flush().
+
+twa(_) ->
+    Ref = make_ref(),
+    ok = ?stat:incr(x, 8),
+    ok = ?stat:incr(x, Ref, 7),
+    %% Flushing a reference doesn't affect registered pids.
+    [{x,7}] = ?stat:flush(Ref),
+    [] = ?stat:flush(Ref),
+    [{x,8}] = ?stat:flush(),
+    [] = ?stat:flush().