error listener get called twice on mocked error with sync handler

[mikicho]

If we remove the await from this test. the Error: socket hang up error get called.

  request.on('error', (error: ConnectionError) => {
    // this log two errors: "ConnectionRefusedError: connect ECONNREFUSED ::1 4444" and then "Error: socket hang up"
    console.log(error);

    errorPromise.resolve(error)
  })

as a workaround, I added setTimeout(.., 5).

[mikicho]

Why do we call this.terminate on mocked error?

[mikicho]

duplicate #474