test: refactor emqx_takeover_SUITE

test/emqx_shared_sub_SUITE.erl

@@ -51,7 +51,7 @@ init_per_suite(Config) ->
     PortDiscovery = application:get_env(gen_rpc, port_discovery),
     application:set_env(gen_rpc, port_discovery, stateless),
     application:ensure_all_started(gen_rpc),
-    %% ensure emqx_moduels' app modules are loaded
+    %% ensure emqx_modules app modules are loaded
     %% so the mnesia tables are created
     ok = load_app(emqx_modules),
     emqx_ct_helpers:start_apps([]),

test/emqx_takeover_SUITE.erl

@@ -32,29 +32,43 @@
 all() -> emqx_ct:all(?MODULE).
 
 init_per_suite(Config) ->
-    emqx_ct_helpers:start_apps([emqx]),
+    emqx_ct_helpers:start_apps([]),
     Config.
 
 end_per_suite(_Config) ->
-    emqx_ct_helpers:stop_apps([emqx]),
+    emqx_ct_helpers:stop_apps([]),
     ok.
+
+init_per_testcase(Case, Config) ->
+    ?MODULE:Case({'init', Config}).
+
+end_per_testcase(Case, Config) ->
+    ?MODULE:Case({'end', Config}).
+
 %%--------------------------------------------------------------------
 %% Testcases
 
-t_takeover(_) ->
-    process_flag(trap_exit, true),
+t_takeover({init, Config}) when is_list(Config) ->
+    Config;
+t_takeover({'end', Config}) when is_list(Config) ->
+    ok;
+t_takeover(Config) when is_list(Config) ->
     AllMsgs = messages(?CNT),
     Pos = rand:uniform(?CNT),
-    ClientId = <<"clientid">>,
+    ClientId = random_clientid(),
+    ClientOpts = [{clientid, ClientId},
+                  {clean_start, false},
+                  {host, "127.0.0.1"},
+                  {port, 1883}
+                 ],
     C1 =
         with_retry(
           fun() ->
-              {ok, C} = emqtt:start_link([{clientid, ClientId}, {clean_start, false}]),
+              {ok, C} = emqtt:start_link(ClientOpts),
               {ok, _} = emqtt:connect(C),
               C
           end, 5),
     emqtt:subscribe(C1, <<"t">>, 1),
-
     spawn(fun() ->
             [begin
                 emqx:publish(lists:nth(I, AllMsgs)),
@@ -63,28 +77,55 @@ t_takeover(_) ->
           end),
     emqtt:pause(C1),
     timer:sleep(?CNT*10),
-
     load_meck(ClientId),
-    spawn(fun() ->
-            [begin
-                emqx:publish(lists:nth(I, AllMsgs)),
-                timer:sleep(rand:uniform(10))
-             end || I <- lists:seq(Pos+1, ?CNT)]
-          end),
-    {ok, C2} = emqtt:start_link([{clientid, ClientId}, {clean_start, false}]),
-    {ok, _} = emqtt:connect(C2),
-
-    Received = all_received_publishs(),
-    ct:pal("middle: ~p, received: ~p", [Pos, [P || {publish, #{payload := P}} <- Received]]),
-    assert_messages_missed(AllMsgs, Received),
-    assert_messages_order(AllMsgs, Received),
-
-    emqtt:disconnect(C2),
-    unload_meck(ClientId).
+    try
+        spawn(fun() ->
+                [begin
+                    emqx:publish(lists:nth(I, AllMsgs)),
+                    timer:sleep(rand:uniform(10))
+                end || I <- lists:seq(Pos+1, ?CNT)]
+            end),
+        {ok, C2} = emqtt:start_link(ClientOpts),
+        %% C1 is going down, unlink it so the test can continue to run
+        _ = monitor(process, C1),
+        ?assert(erlang:is_process_alive(C1)),
+        unlink(C1),
+        {ok, _} = emqtt:connect(C2),
+        receive
+            {'DOWN', _, process, C1, _} ->
+                ok
+        after 1000 ->
+                  ct:fail("timedout_waiting_for_old_connection_shutdown")
+        end,
+        Received = all_received_publishs(),
+        ct:pal("middle: ~p, received: ~p", [Pos, [P || {publish, #{payload := P}} <- Received]]),
+        assert_messages_missed(AllMsgs, Received),
+        assert_messages_order(AllMsgs, Received),
+        kill_process(C2, fun emqtt:stop/1)
+    after
+        unload_meck(ClientId)
+    end.
 
 %%--------------------------------------------------------------------
 %% Helpers
 
+random_clientid() ->
+    iolist_to_binary(["clientid", "-", integer_to_list(erlang:system_time())]).
+
+kill_process(Pid, WithFun) ->
+    _ = unlink(Pid),
+    _ = monitor(process, Pid),
+    try WithFun(Pid)
+    catch _:_ -> ok
+    end,
+    receive
+        {'DOWN', _, process, Pid, _} ->
+            ok
+    after 10_000 ->
+              exit(Pid, kill),
+              error(timeout)
+    end.
+
 with_retry(Fun, 1) -> Fun();
 with_retry(Fun, N) when N > 1 ->
     try