go example 源码
golang example 代码
文件路径：/src/go/doc/testdata/example.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testing
import (
"bytes"
"fmt"
"io"
"os"
"strings"
"time"
)
type InternalExample struct {
Name string
F func()
Output string
}
func RunExamples(examples []InternalExample) (ok bool) {
ok = true
var eg InternalExample
stdout, stderr := os.Stdout, os.Stderr
defer func() {
os.Stdout, os.Stderr = stdout, stderr
if e := recover(); e != nil {
fmt.Printf("--- FAIL: %s\npanic: %v\n", eg.Name, e)
os.Exit(1)
}
}()
for _, eg = range examples {
if *chatty {
fmt.Printf("=== RUN: %s\n", eg.Name)
}
// capture stdout and stderr
r, w, err := os.Pipe()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
os.Stdout, os.Stderr = w, w
outC := make(chan string)
go func() {
buf := new(bytes.Buffer)
_, err := io.Copy(buf, r)
if err != nil {
fmt.Fprintf(stderr, "testing: copying pipe: %v\n", err)
os.Exit(1)
}
outC <- buf.String()
}()
// run example
t0 := time.Now()
eg.F()
dt := time.Now().Sub(t0)
// close pipe, restore stdout/stderr, get output
w.Close()
os.Stdout, os.Stderr = stdout, stderr
out := <-outC
// report any errors
tstr := fmt.Sprintf("(%.2f seconds)", dt.Seconds())
if g, e := strings.TrimSpace(out), strings.TrimSpace(eg.Output); g != e {
fmt.Printf("--- FAIL: %s %s\ngot:\n%s\nwant:\n%s\n",
eg.Name, tstr, g, e)
ok = false
} else if *chatty {
fmt.Printf("--- PASS: %s %s\n", eg.Name, tstr)
}
}
return
}
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