code: func (ete TestTime) Add(testName, nodeName, Endtime string) {
  	if _, ok := ete[nodeName]; !ok {
  		ete[nodeName] = make(map[string]time.Time)
  	}
  	if _, ok := ete[nodeName][testName]; !ok {
  		end, err := time.Parse(testLogTimeFormat, Endtime)
  		if err != nil {
  			log.Fatal(err)
  		}
  		ete[nodeName][testName] = end
  	}
  }
docs: // Add adds one end time into TestTime.