From 56044085c85cfefd890604bab2f3f383cbe7d76f Mon Sep 17 00:00:00 2001
From: Shawn <506895667@qq.com>
Date: Wed, 20 Apr 2022 12:04:29 +0800
Subject: [PATCH] fix(test): make mria fall back to use mnesia db_backend when
 running test

---
 apps/emqx/test/emqx_common_test_helpers.erl | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/apps/emqx/test/emqx_common_test_helpers.erl b/apps/emqx/test/emqx_common_test_helpers.erl
index 33943ddbd..cda953a76 100644
--- a/apps/emqx/test/emqx_common_test_helpers.erl
+++ b/apps/emqx/test/emqx_common_test_helpers.erl
@@ -150,7 +150,7 @@ start_apps(Apps, Handler) when is_function(Handler) ->
     %% Load all application code to beam vm first
     %% Because, minirest, ekka etc.. application will scan these modules
     lists:foreach(fun load/1, [emqx | Apps]),
-    ekka:start(),
+    ok = start_ekka(),
     ok = emqx_ratelimiter_SUITE:base_conf(),
     lists:foreach(fun(App) -> start_app(App, Handler) end, [emqx | Apps]).
 
@@ -484,3 +484,12 @@ is_tcp_server_available(Host, Port, Timeout) ->
         {error, _} ->
             false
     end.
+
+start_ekka() ->
+    try mnesia_hook:module_info() of
+        _ -> ekka:start()
+    catch _:_ ->
+        %% Falling back to using Mnesia DB backend.
+        application:set_env(mria, db_backend, mnesia),
+        ekka:start()
+    end.