Update Go library to last weekly.

From-SVN: r180552

libgo/go/testing/example.go

@@ -0,0 +1,84 @@
+// 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"
+	"time"
+)
+
+type InternalExample struct {
+	Name   string
+	F      func()
+	Output string
+}
+
+func RunExamples(examples []InternalExample) (ok bool) {
+	ok = true
+
+	stdout, stderr := os.Stdout, os.Stderr
+	defer func() {
+		os.Stdout, os.Stderr = stdout, stderr
+		if e := recover(); e != nil {
+			if err, ok := e.(os.Error); ok {
+				fmt.Fprintln(os.Stderr, err)
+				os.Exit(1)
+			}
+			panic(e)
+		}
+	}()
+
+	for _, eg := range examples {
+		if *chatty {
+			fmt.Fprintln(os.Stderr, "=== RUN:", eg.Name)
+		}
+
+		// capture stdout and stderr for testing purposes
+		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.Fprintln(os.Stderr, err)
+				os.Exit(1)
+			}
+			outC <- buf.String()
+		}()
+
+		// run example
+		ns := -time.Nanoseconds()
+		eg.F()
+		ns += time.Nanoseconds()
+
+		// close pipe, restore stdout/stderr, get output
+		w.Close()
+		os.Stdout, os.Stderr = stdout, stderr
+		out := <-outC
+
+		// report any errors
+		if out != eg.Output {
+			fmt.Fprintf(
+				os.Stderr,
+				"--- FAIL: %s\ngot:\n%s\nwant:\n%s\n",
+				eg.Name, out, eg.Output,
+			)
+			ok = false
+		} else if *chatty {
+			tstr := fmt.Sprintf("(%.2f seconds)", float64(ns)/1e9)
+			fmt.Fprintln(os.Stderr, "--- PASS:", eg.Name, tstr)
+		}
+	}
+
+	return
+}