The old code allocated QSignalSpies on the heap and stored them in a non-owning container, so if one of the many check macros trigger, those objects would be leaked. Ditto QNetworkReplies. The code also used dynamically-sized containers for statically-sized data; a common anti-pattern. Hold the sample QUrls in a C array instead, QSignalSpies in C arrays of std::optional (to delay initialization) and QNetworkReplies in a C array of std::unique_ptr with the existing QScopedPointerDeleteLater deleter. Pick-to: 6.7 Change-Id: I7305115af15c079abba6d45c5de8db2198ea7a6d Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>