The way timeouts are thrown cause the binary to exit immediately

This circumvents T.Cleanup and any cleanup logic that might have been in TestMain. In order to guarantee setup/teardown occurs it has to be done outside the go test process. Thus either a testing script or the use of go test -exec xprog

The challenge with these workarounds is you lose the simplicity of invoking go test.

Thus my ask is

1. when a timeout occurs run T.Cleanup functions
2. considering surfacing the timeout as a panic but allow the ability to handle that panic

My second point could be accomplished by having the panic be surfaced by M.Run() and could be handled in the following way

func TestMain(m *testing.M) {
   os.Exit(run(m))
}

func run(m *testing.M) (exitCode int) {
  setup()
  defer cleanup()
  exitCode = m.Run()
}