我有以下代码:
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"time"
)
type twitterResult struct {
Results []struct {
Text string `json:"text"`
Ids string `json:"id_str"`
Name string `json:"from_user_name"`
Username string `json:"from_user"`
UserId string `json:"from_user_id_str"`
}
}
var (
twitterUrl = "http://search.twitter.com/search.json?q=%23UCL"
pauseDuration = 5 * time.Second
)
func retrieveTweets(c chan<- *twitterResult) {
for {
resp, err := http.Get(twitterUrl)
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
r := new(twitterResult) //or &twitterResult{} which returns *twitterResult
err = json.Unmarshal(body, &r)
if err != nil {
log.Fatal(err)
}
c <- r
time.Sleep(pauseDuration)
}
}
func displayTweets(c chan *twitterResult) {
tweets := <-c
for _, v := range tweets.Results {
fmt.Printf("%v:%v\n", v.Username, v.Text)
}
}
func main() {
c := make(chan *twitterResult)
go retrieveTweets(c)
for {
displayTweets(c)
}
}
我想为它编写一些测试,但我不确定如何使用httptest包http://golang.org/pkg/net/http/httptest/会赞赏一些指针
我想出了这个(从OAuth https://code.google.com/p/goauth2/source/browse/oauth/oauth_test.go的测试中无耻地复制):
var request = struct {
path, query string // request
contenttype, body string // response
}{
path: "/search.json?",
query: "q=%23Kenya",
contenttype: "application/json",
body: twitterResponse,
}
var (
twitterResponse = `{ 'results': [{'text':'hello','id_str':'34455w4','from_user_name':'bob','from_user_id_str':'345424'}]}`
)
func TestRetrieveTweets(t *testing.T) {
handler := func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", request.contenttype)
io.WriteString(w, request.body)
}
server := httptest.NewServer(http.HandlerFunc(handler))
defer server.Close()
resp, err := http.Get(server.URL)
if err != nil {
t.Fatalf("Get: %v", err)
}
checkBody(t, resp, twitterResponse)
}
func checkBody(t *testing.T, r *http.Response, body string) {
b, err := ioutil.ReadAll(r.Body)
if err != nil {
t.Error("reading reponse body: %v, want %q", err, body)
}
if g, w := string(b), body; g != w {
t.Errorf("request body mismatch: got %q, want %q", g, w)
}
}
答案 0 :(得分:71)
httptest执行两种类型的测试:响应和服务器
回应测试:
func TestHeader3D(t *testing.T) {
resp := httptest.NewRecorder()
uri := "/3D/header/?"
path := "/home/test"
unlno := "997225821"
param := make(url.Values)
param["param1"] = []string{path}
param["param2"] = []string{unlno}
req, err := http.NewRequest("GET", uri+param.Encode(), nil)
if err != nil {
t.Fatal(err)
}
http.DefaultServeMux.ServeHTTP(resp, req)
if p, err := ioutil.ReadAll(resp.Body); err != nil {
t.Fail()
} else {
if strings.Contains(string(p), "Error") {
t.Errorf("header response shouldn't return error: %s", p)
} else if !strings.Contains(string(p), `expected result`) {
t.Errorf("header response doen't match:\n%s", p)
}
}
}
服务器测试(这是您需要使用的):
func TestIt(t *testing.T){
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
fmt.Fprintln(w, `{"fake twitter json string"}`)
}))
defer ts.Close()
twitterUrl = ts.URL
c := make(chan *twitterResult)
go retrieveTweets(c)
tweet := <-c
if tweet != expected1 {
t.Fail()
}
tweet = <-c
if tweet != expected2 {
t.Fail()
}
}
顺便说一下,你不需要传入r的指针,因为它已经是一个指针。
err = json.Unmarshal(body, r)
编辑:对于我的录音机测试,我可以使用我的http处理程序:
handler(resp, req)
但是我的原始代码没有使用默认的mux(但是来自Gorilla / mux),而且我在mux周围有一些包装,例如插入服务器日志记录,并添加请求上下文(Gorilla / context),所以我不得不从多路复用器启动并调用ServeHTTP
答案 1 :(得分:7)
package myserver import ( "fmt" "io/ioutil" "net/http" "net/http/httptest" "testing" ) func TestMyHandler(t *testing.T) { handler := &MyHandler{} server := httptest.NewServer(handler) defer server.Close() for _, i := range []int{1, 2} { resp, err := http.Get(server.URL) if err != nil { t.Fatal(err) } if resp.StatusCode != 200 { t.Fatalf("Received non-200 response: %d\n", resp.StatusCode) } expected := fmt.Sprintf("Visitor count: %d.", i) actual, err := ioutil.ReadAll(resp.Body) if err != nil { t.Fatal(err) } if expected != string(actual) { t.Errorf("Expected the message '%s'\n", expected) } } }
package myserver import ( "fmt" "net/http" "sync" ) type MyHandler struct { sync.Mutex count int } func (h *MyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { var count int h.Lock() h.count++ count = h.count h.Unlock() fmt.Fprintf(w, "Visitor count: %d.", count) }
答案 2 :(得分:6)
如果您想测试您的程序,通常最好在考虑测试的情况下编写它。例如,如果您将retrieveTweets
函数的内部循环解压缩为:
func downloadTweets(tweetsUrl string) (*twitterResult, error)
您可以使用httptest
包设置的测试服务器的URL调用它,而不必担心睡眠或重复请求。