diff --git a/test/common_helper/test.hpp b/test/common_helper/test.hpp
index 6753f40..a0d7937 100644
--- a/test/common_helper/test.hpp
+++ b/test/common_helper/test.hpp
@@ -154,6 +154,17 @@ struct ret_val {
 	constexpr inline const ret_val_s& operator[](std::size_t i) const { return vals[i]; }
 };
 
+template<typename Ctx>
+concept ctx_has_type_num = requires {
+		typename Ctx::type;
+		{ Ctx::nr } -> std::convertible_to<std::size_t>;
+};
+
+template<typename Ctx>
+concept ctx_has_type = requires {
+		typename Ctx::type;
+};
+
 struct empty_param {};
 
 struct test_common_params {