💚 fix unit test

tests/src/unit-bson.cpp

@@ -10,6 +10,9 @@
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+#ifdef JSON_TEST_NO_GLOBAL_UDLS
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
+#endif
 
 #include <fstream>
 #include <sstream>