Go语言用mock server模拟调用(httptest)

mock是个好东东，

在大项目或大公司，很实用，

因为很多环境不是随时在开发环境可得的。

package main

import (
	"testing"
	"net/http"
	"fmt"
	"net/http/httptest"
)

const checkMark = " OK! "
const ballotX = " ERROR! "

var feed = `<?xml version="1.0" encoding="UTF-8"?>
		<rss>
			<channel>
				<title>Going Go Programming</title>
				<description>Golang : https://github.com/goinggo</description>
				<link>http://www.goinggo.net/</link>
				<item>
					<pubDate>Sun, 15 Mar 2015 15:04:00 +0000</pubDate>
					<title>Object Oriented Programming Mechanics</title>
					<description>Go is an object oriented language.</description>
					<link>http://www.goinggo.net/2015/03/object-oriented</link>
				</item>
		</channel>
	</rss>`

func mockServer() *httptest.Server {
	f := func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(200)
		w.Header().Set("Content-Type", "application/xml")
		fmt.Fprintln(w, feed)
	}
	return httptest.NewServer(http.HandlerFunc(f))
}

func TestDownload(t *testing.T) {
	statusCode := http.StatusOK

	server := mockServer()
	defer server.Close()

	t.Log("Given the need to test downloading content.")
	{

		t.Logf("\tWhen checking \"%s\" for status code \"%d\"", server.URL, statusCode)
		{
			resp, err := http.Get(server.URL)
			if err != nil {
				t.Fatal("\tShould be able to make the Get call.", ballotX, err)
			}
			t.Log("\t\tShould be able to make the Get call.", checkMark)
			defer resp.Body.Close()

			if resp.StatusCode == statusCode {
				t.Logf("\t\tShould receive a \"%d\" status, %v", statusCode, checkMark)
			} else {
				t.Errorf("\t\tShould receive a \"%d\" status. %v %v", statusCode, ballotX, resp.StatusCode)
			}
		}
	}
}