fix: os.Exit() kills any deferred cleanup functions

os.Exit() itself is now also a deferred function, which will be the last to run.

cnet/service_test.go

@@ -32,6 +32,7 @@ func TestMain(m *testing.M) {
 		panic(err)
 	}
 
+	// this is fine since we don't defer anything
 	os.Exit(m.Run())
 }