From f0a0c7d4b1b654d5531b5b91236be29a56394b10 Mon Sep 17 00:00:00 2001
From: Andrew Mayorov <encube.ul@gmail.com>
Date: Mon, 4 Sep 2023 14:38:52 +0400
Subject: [PATCH] fix(cthsuite): avoid duplicate application env entries

Because `application:set_env/1` complains loudly if there are
duplicates.
---
 apps/emqx/test/emqx_cth_suite.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/emqx/test/emqx_cth_suite.erl b/apps/emqx/test/emqx_cth_suite.erl
index 307e8d98b..e5668b77a 100644
--- a/apps/emqx/test/emqx_cth_suite.erl
+++ b/apps/emqx/test/emqx_cth_suite.erl
@@ -261,7 +261,7 @@ merge_envs(false, E2) ->
 merge_envs(_E, false) ->
     [];
 merge_envs(E1, E2) ->
-    E1 ++ E2.
+    lists:foldl(fun({K, _} = Opt, EAcc) -> lists:keystore(K, 1, EAcc, Opt) end, E1, E2).
 
 merge_config(false, C2) ->
     C2;