From f78c30c9ff26414a63962cf52b529dec65e24309 Mon Sep 17 00:00:00 2001
From: "Zaiming (Stone) Shi" <zmstone@gmail.com>
Date: Fri, 16 Feb 2024 13:49:05 +0100
Subject: [PATCH] test: reduce false warning messages in test logs

---
 apps/emqx/src/emqx_config_handler.erl | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/apps/emqx/src/emqx_config_handler.erl b/apps/emqx/src/emqx_config_handler.erl
index 4cc5b2908..c20a74a5b 100644
--- a/apps/emqx/src/emqx_config_handler.erl
+++ b/apps/emqx/src/emqx_config_handler.erl
@@ -675,9 +675,19 @@ merge_to_override_config(RawConf, Opts) ->
     maps:merge(UpgradedOldConf, RawConf).
 
 upgrade_conf(Conf) ->
+    ConfigLoader = emqx_app:get_config_loader(),
+    %% ensure module loaded
+    _ = ConfigLoader:module_info(),
+    case erlang:function_exported(ConfigLoader, schema_module, 0) of
+        true ->
+            try_upgrade_conf(apply(ConfigLoader, schema_module, []), Conf);
+        false ->
+            %% this happens during emqx app standalone test
+            Conf
+    end.
+
+try_upgrade_conf(SchemaModule, Conf) ->
     try
-        ConfLoader = emqx_app:get_config_loader(),
-        SchemaModule = apply(ConfLoader, schema_module, []),
         apply(SchemaModule, upgrade_raw_conf, [Conf])
     catch
         ErrorType:Reason:Stack ->