How to use httptest in Go

golang-httptest

import "net/http/httptest"
import "net/http"

type DummyHttp struct {
}

func (d DummyHttp) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
	rw.Header().Set("Content-Type", "text/plain")
	rw.Write([]byte("Result from Dummy Server"))
}

func NewServer() *httptest.Server {
	return httptest.NewServer(&DummyHttp{})
}

func main() {
	server := NewServer()
	defer server.Close()
	url := server.URL

	// Do something with server
}