diff --git a/test/common_helper/test.hpp b/test/common_helper/test.hpp
index 9677502..3186d75 100644
--- a/test/common_helper/test.hpp
+++ b/test/common_helper/test.hpp
@@ -20,6 +20,8 @@
 template<typename T, std::size_t N>
 consteval std::size_t c_arr_len(T (&arr)[N]) { return N; }
 
+constexpr auto make_copy(auto& value) -> std::remove_cvref_t<decltype(value)> { return value; }
+
 #define ADD_TYPE_HINT(type) template <> constexpr const char* const to_type_hint_str::value<type> = #type
 
 #define TEST_FAIL(msg) ret_val_s { "", ReturnCode::FAILED, msg }