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I tried to unit test the method "FilterDataProvider.handleNewFlow" from the sample project https://developer.apple.com/documentation/networkextension/filtering_network_traffic I always get this below issue, Undefined symbols: Linker command failed with exit code 1 (use -v to see invocation) Could someone help with it?

Hey team, We have a use case where we need to block all the MacOS network traffic except our app's network traffic. But I don't find any apis from apple with that capability. I see using NEFilterSettings, we can allow the required endpoints and block all the other endpoints we get from handleNewFlow(_ flow:. But this api has a control in endpoint level not the app level. Could you suggest if we have any other apis for this use case? Thanks