Fix test case error

test/emqx_broker_SUITE.erl

@@ -58,6 +58,7 @@ t_subopts(_) ->
     ?assertEqual(undefined, emqx_broker:get_subopts(self(), <<"topic">>)),
     ?assertEqual(undefined, emqx_broker:get_subopts(<<"clientid">>, <<"topic">>)),
     emqx_broker:subscribe(<<"topic">>, <<"clientid">>, #{qos => 1}),
+    timer:sleep(200),
     ?assertEqual(#{qos => 1, subid => <<"clientid">>}, emqx_broker:get_subopts(self(), <<"topic">>)),
     ?assertEqual(#{qos => 1, subid => <<"clientid">>}, emqx_broker:get_subopts(<<"clientid">>,<<"topic">>)),
     emqx_broker:subscribe(<<"topic">>, <<"clientid">>, #{qos => 2}),