code: func MakeConfigFile(cfg *config.GCSCli) string {
  	cfgBytes, err := json.Marshal(cfg)
  	Expect(err).ToNot(HaveOccurred())
  	tmpFile, err := ioutil.TempFile("", "gcscli-test")
  	Expect(err).ToNot(HaveOccurred())
  	_, err = tmpFile.Write(cfgBytes)
  	Expect(err).ToNot(HaveOccurred())
  	err = tmpFile.Close()
  	Expect(err).ToNot(HaveOccurred())
  	return tmpFile.Name()
  }
docs: // MakeConfigFile creates a config file from a GCSCli config struct