doc/articles/wiki: fix racy test

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/6853069

doc/articles/wiki/get.go

@@ -13,11 +13,13 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"time"
 )
 
 var (
 	post = flag.String("post", "", "urlencoded form data to POST")
 	addr = flag.Bool("addr", false, "find open address and print to stdout")
+	wait = flag.Duration("wait_for_port", 0, "if non-zero, the amount of time to wait for the address to become available")
 )
 
 func main() {
@@ -37,12 +39,19 @@ func main() {
 	}
 	var r *http.Response
 	var err error
+	loopUntil := time.Now().Add(*wait)
+	for {
 		if *post != "" {
 			b := strings.NewReader(*post)
 			r, err = http.Post(url, "application/x-www-form-urlencoded", b)
 		} else {
 			r, err = http.Get(url)
 		}
+		if err == nil || *wait == 0 || time.Now().After(loopUntil) {
+			break
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
 	if err != nil {
 		log.Fatal(err)
 	}

doc/articles/wiki/test.bash

@@ -18,9 +18,7 @@ go build -o final-test.bin final-test.go
 (./final-test.bin) &
 wiki_pid=$!
 
-sleep 1
-
-./get.bin http://$addr/edit/Test > test_edit.out
+./get.bin --wait_for_port=5s http://$addr/edit/Test > test_edit.out
 diff -u test_edit.out test_edit.good
 ./get.bin -post=body=some%20content http://$addr/save/Test
 diff -u Test.txt test_Test.txt.good