test: add facility for starting `emqx_dashboard` with `emqx_cth_suite`

apps/emqx_management/test/emqx_mgmt_api_test_util.erl

@@ -50,6 +50,21 @@ set_special_configs(emqx_dashboard) ->
 set_special_configs(_App) ->
     ok.
 
+-spec emqx_dashboard() -> emqx_cth_suite:appspec().
+emqx_dashboard() ->
+    emqx_dashboard("dashboard.listeners.http { enable = true, bind = 18083 }").
+
+emqx_dashboard(Config) ->
+    {emqx_dashboard, #{
+        config => Config,
+        before_start => fun() ->
+            {ok, _} = emqx_common_test_http:create_default_app()
+        end,
+        after_start => fun() ->
+            true = emqx_dashboard_listener:is_ready(infinity)
+        end
+    }}.
+
 %% there is no difference between the 'request' and 'request_api'
 %% the 'request' is only to be compatible with the 'emqx_dashboard_api_test_helpers:request'
 request(Method, Url) ->