Add t_mnesia/1 test case

test/emqx_trie_SUITE.erl

@@ -24,7 +24,7 @@
 -define(TRIE_TABS, [emqx_trie, emqx_trie_node]).
 
 all() ->
-    [t_insert, t_match, t_match2, t_match3, t_delete, t_delete2, t_delete3].
+    [t_mnesia, t_insert, t_match, t_match2, t_match3, t_delete, t_delete2, t_delete3].
 
 init_per_suite(Config) ->
     application:load(emqx),
@@ -42,6 +42,9 @@ init_per_testcase(_TestCase, Config) ->
 end_per_testcase(_TestCase, _Config) ->
     clear_tables().
 
+t_mnesia(_) ->
+    ok = ?TRIE:mnesia(copy).
+
 t_insert(_) ->
     TN = #trie_node{node_id = <<"sensor">>,
                     edge_count = 3,