There doesn't seem to be a post-build solution task. One could presumably hack it by creating a dummy project that is the last one to build and put a beep in the post-build project.
9 Answers
You can also now as of VS2019 gain access to the system sounds through the UI. Go Options->Test.
You can also find more info out here: https://docs.microsoft.com/en-us/visualstudio/test/run-unit-tests-with-test-explorer?view=vs-2019#test-audio-cue
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