fix: unit tests fixed for DOWNCAST_MODE = OFF

test/unit_test/runtime/fmt_test.cpp

@@ -467,7 +467,11 @@ TEST_CASE("operator<< on a quantity", "[text][ostream][fmt]")
 
     SECTION("percents")
     {
+#if DOWNCAST_MODE == 0
+      const auto q = quantity_cast<dimensionless<percent>>(15._q_m / 100._q_m);
+#else
       const auto q = quantity_cast<percent>(15._q_m / 100._q_m);
+#endif
       os << q;
 
       SECTION("iostream")