code: func MakeContentFile(content string) string {
  	tmpFile, err := ioutil.TempFile("", "gcscli-test-content")
  	Expect(err).ToNot(HaveOccurred())
  	_, err = tmpFile.Write([]byte(content))
  	Expect(err).ToNot(HaveOccurred())
  	err = tmpFile.Close()
  	Expect(err).ToNot(HaveOccurred())
  	return tmpFile.Name()
  }
docs: // MakeContentFile creates a temporary file with content to upload to GCS