diff --git a/manage_test.go b/manage_test.go
index 63f8b61..3d6eeb4 100644
--- a/manage_test.go
+++ b/manage_test.go
@@ -289,4 +289,6 @@ tag = golang
 	is.Equal(23, u2.Age)
 	is.Equal("inhere", u2.UserName)
 	is.Equal("golang", u2.Subs.Tag)
+
+	is.Error(conf.MapStruct("not-exist", u2))
 }