[test] maybe unused assert variable in release

Author: FrancoisCarouge

test/utility_identity_default.cpp

@@ -46,7 +46,7 @@ namespace {
 //! @test Verifies the 1x1 identity matrix deduced default value is a unit
 //! double.
 [[maybe_unused]] auto test{[] {
-  auto i{identity<>};
+  [[maybe_unused]] auto i{identity<>};
 
   assert(i == 1.0);
   static_assert(std::is_same_v<decltype(i), double>);

test/utility_zero_default.cpp

@@ -45,7 +45,7 @@ namespace fcarouge::test {
 namespace {
 //! @test Verifies the 1x1 zero matrix deduced default value is a null double.
 [[maybe_unused]] auto test{[] {
-  auto z{zero<>};
+  [[maybe_unused]] auto z{zero<>};
 
   assert(z == 0.0);
   static_assert(std::is_same_v<decltype(z), double>);