Rewritten test to not use <format>

test/main.cpp

@@ -15,12 +15,15 @@
 #define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
 #include "doctest/doctest.h"
 
-#include <format>
+#include <string>
 
 #include <sparrow/sparrow_version.hpp>
 
 TEST_CASE("version is readable")
 {
+    // TODO: once available on OSX, use `<format>` facility instead.
+    // We only try to make sure the version valeus are printable, whatever their type.
+    // AKA this is not written to be fancy but to force conversion to string.
     using namespace sparrow;
-    [[maybe_unused]] const std::string printable_version = std::format("sparrow version : {}.{}.{}", SPARROW_VERSION_MAJOR, SPARROW_VERSION_MINOR, SPARROW_VERSION_PATCH);
+    [[maybe_unused]] const std::string printable_version = std::string("sparrow version : ") + std::to_string(SPARROW_VERSION_MAJOR) + "." + std::to_string(SPARROW_VERSION_MINOR) "." std::to_string(SPARROW_VERSION_PATCH);
 }