9 files changed, 41 insertions, 50 deletions
diff --git a/lib/diameter/test/diameter_capx_SUITE.erl b/lib/diameter/test/diameter_capx_SUITE.erl
index 4270210a10..c1ecd7bb14 100644
--- a/lib/diameter/test/diameter_capx_SUITE.erl
+++ b/lib/diameter/test/diameter_capx_SUITE.erl
@@ -105,20 +105,14 @@ suite() ->
 all() -> [start,
           start_services,
           add_listeners,
-          {group, sequential},
-          {group, parallel},
+          {group, all},
+          {group, all, [parallel]},
           remove_listeners,
           stop_services,
           stop].
 
 groups() ->
-    Ts = testcases(),
-    [{grp(P), P, Ts} || P <- [[], [parallel]]].
-
-grp([]) ->
-    sequential;
-grp([parallel = P]) ->
-    P.
+    [{all, [], lists:flatmap(fun tc/1, tc())}].
 
 init_per_group(_Name, Config) ->
     Config.
@@ -145,9 +139,6 @@ end_per_testcase(Name, Config) ->
     ok = diameter:remove_transport(?CLIENT, CRef).
 
 %% Testcases all come in two flavours, client and server.
-testcases() ->
-    lists:flatmap(fun tc/1, tc()).
-
 tc(Name) ->
     [?A([C,$_|?L(Name)]) || C <- "cs"].
 
diff --git a/lib/diameter/test/diameter_dict_SUITE.erl b/lib/diameter/test/diameter_dict_SUITE.erl
index 87bb9727fe..ce68296877 100644
--- a/lib/diameter/test/diameter_dict_SUITE.erl
+++ b/lib/diameter/test/diameter_dict_SUITE.erl
@@ -53,10 +53,11 @@ suite() ->
     [{timetrap, {seconds, 10}}].
 
 all() ->
-    [{group, all} | tc()].
+    [{group, all},
+     {group, all, [parallel]}].
 
 groups() ->
-    [{all, [parallel], tc()}].
+    [{all, [], tc()}].
 
 tc() ->
     [append,
diff --git a/lib/diameter/test/diameter_reg_SUITE.erl b/lib/diameter/test/diameter_reg_SUITE.erl
index ade824c9dd..e9d6f7725c 100644
--- a/lib/diameter/test/diameter_reg_SUITE.erl
+++ b/lib/diameter/test/diameter_reg_SUITE.erl
@@ -48,10 +48,11 @@ suite() ->
     [{timetrap, {seconds, 10}}].
 
 all() ->
-    [{group, all} | tc()].
+    [{group, all},
+     {group, all, [parallel]}].
 
 groups() ->
-    [{all, [parallel], tc()}].
+    [{all, [], tc()}].
 
 tc() ->
     [add,
diff --git a/lib/diameter/test/diameter_relay_SUITE.erl b/lib/diameter/test/diameter_relay_SUITE.erl
index 32b30d3cca..165bb44f87 100644
--- a/lib/diameter/test/diameter_relay_SUITE.erl
+++ b/lib/diameter/test/diameter_relay_SUITE.erl
@@ -117,15 +117,17 @@ suite() ->
     [{timetrap, {seconds, 10}}].
 
 all() ->
-    [start, start_services, connect]
-        ++ tc()
-        ++ [{group, all},
-            disconnect,
-            stop_services,
-            stop].
+    [start,
+     start_services,
+     connect,
+     {group, all},
+     {group, all, [parallel]},
+     disconnect,
+     stop_services,
+     stop].
 
 groups() ->
-    [{all, [parallel], tc()}].
+    [{all, [], tc()}].
 
 init_per_group(_, Config) ->
     Config.
diff --git a/lib/diameter/test/diameter_stats_SUITE.erl b/lib/diameter/test/diameter_stats_SUITE.erl
index e50a0050a6..e473afc541 100644
--- a/lib/diameter/test/diameter_stats_SUITE.erl
+++ b/lib/diameter/test/diameter_stats_SUITE.erl
@@ -44,10 +44,11 @@ suite() ->
     [{timetrap, {seconds, 10}}].
 
 all() ->
-    [{group, all} | tc()].
+    [{group, all},
+     {group, all, [parallel]}].
 
 groups() ->
-    [{all, [parallel], tc()}].
+    [{all, [], tc()}].
 
 tc() ->
     [an,
diff --git a/lib/diameter/test/diameter_sync_SUITE.erl b/lib/diameter/test/diameter_sync_SUITE.erl
index 84f77b6066..1e0dbd634c 100644
--- a/lib/diameter/test/diameter_sync_SUITE.erl
+++ b/lib/diameter/test/diameter_sync_SUITE.erl
@@ -48,10 +48,11 @@ suite() ->
     [{timetrap, {seconds, 10}}].
 
 all() ->
-    [{group, all} | tc()].
+    [{group, all},
+     {group, all, [parallel]}].
 
 groups() ->
-    [{all, [parallel], tc()}].
+    [{all, [], tc()}].
 
 tc() ->
     [call,
diff --git a/lib/diameter/test/diameter_tls_SUITE.erl b/lib/diameter/test/diameter_tls_SUITE.erl
index 38282282b8..eca25ba25e 100644
--- a/lib/diameter/test/diameter_tls_SUITE.erl
+++ b/lib/diameter/test/diameter_tls_SUITE.erl
@@ -136,14 +136,16 @@ all() ->
      start_diameter,
      make_certs,
      start_services,
-     add_transports]
-        ++ [{group, N} || {N, _, _} <- groups()]
-        ++ [remove_transports, stop_services, stop_diameter, stop_ssl].
+     add_transports,
+     {group, all},
+     {group, all, [parallel]},
+     remove_transports,
+     stop_services,
+     stop_diameter,
+     stop_ssl].
 
 groups() ->
-    Ts = tc(),
-    [{all, [], Ts},
-     {p, [parallel], Ts}].
+    [{all, [], tc()}].
 
 init_per_group(_, Config) ->
     Config.
diff --git a/lib/diameter/test/diameter_traffic_SUITE.erl b/lib/diameter/test/diameter_traffic_SUITE.erl
index bc5ca416c2..6eed8d3b5d 100644
--- a/lib/diameter/test/diameter_traffic_SUITE.erl
+++ b/lib/diameter/test/diameter_traffic_SUITE.erl
@@ -162,27 +162,16 @@ suite() ->
     [{timetrap, {seconds, 10}}].
 
 all() ->
-    [start, start_services, add_transports, result_codes
-     | [{group, N} || {N, _, _} <- groups()]]
+    [start, start_services, add_transports, result_codes]
+        ++ [{group, E, P} || E <- ?ENCODINGS, P <- [[], [parallel]]]
         ++ [remove_transports, stop_services, stop].
 
 groups() ->
     Ts = tc(),
-    [{grp(E,P), P, Ts} || E <- ?ENCODINGS, P <- [[], [parallel]]].
-
-grp(E, []) ->
-    E;
-grp(E, [parallel]) ->
-    ?P(E).
+    [{E, [], Ts} || E <- ?ENCODINGS].
 
 init_per_group(Name, Config) ->
-    E = case ?L(Name) of
-            "p_" ++ Rest ->
-                ?A(Rest);
-            _ ->
-                Name
-        end,
-    [{encode, E} | Config].
+    [{encode, Name} | Config].
 
 end_per_group(_, _) ->
     ok.
diff --git a/lib/diameter/test/diameter_transport_SUITE.erl b/lib/diameter/test/diameter_transport_SUITE.erl
index 24d7d44006..1b81c900bf 100644
--- a/lib/diameter/test/diameter_transport_SUITE.erl
+++ b/lib/diameter/test/diameter_transport_SUITE.erl
@@ -92,10 +92,13 @@ suite() ->
     [{timetrap, {minutes, 2}}].
 
 all() ->
-    [start | tc()] ++ [{group, all}, stop].
+    [start,
+     {group, all},
+     {group, all, [parallel]},
+     stop].
 
 groups() ->
-    [{all, [parallel], tc()}].
+    [{all, [], tc()}].
 
 tc() ->
     [tcp_accept,