1 files changed, 100 insertions, 0 deletions
diff --git a/src/testing/example.go b/src/testing/example.go
new file mode 100644
index 000000000..f5762e4db
--- /dev/null
+++ b/src/testing/example.go
@@ -0,0 +1,100 @@
+// 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(matchString func(pat, str string) (bool, error), examples []InternalExample) (ok bool) {
+	ok = true
+
+	var eg InternalExample
+
+	for _, eg = range examples {
+		matched, err := matchString(*match, eg.Name)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "testing: invalid regexp for -test.run: %s\n", err)
+			os.Exit(1)
+		}
+		if !matched {
+			continue
+		}
+		if !runExample(eg) {
+			ok = false
+		}
+	}
+
+	return
+}
+
+func runExample(eg InternalExample) (ok bool) {
+	if *chatty {
+		fmt.Printf("=== RUN: %s\n", eg.Name)
+	}
+
+	// Capture stdout.
+	stdout := os.Stdout
+	r, w, err := os.Pipe()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	os.Stdout = w
+	outC := make(chan string)
+	go func() {
+		buf := new(bytes.Buffer)
+		_, err := io.Copy(buf, r)
+		r.Close()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "testing: copying pipe: %v\n", err)
+			os.Exit(1)
+		}
+		outC <- buf.String()
+	}()
+
+	start := time.Now()
+	ok = true
+
+	// Clean up in a deferred call so we can recover if the example panics.
+	defer func() {
+		dstr := fmtDuration(time.Now().Sub(start))
+
+		// Close pipe, restore stdout, get output.
+		w.Close()
+		os.Stdout = stdout
+		out := <-outC
+
+		var fail string
+		err := recover()
+		if g, e := strings.TrimSpace(out), strings.TrimSpace(eg.Output); g != e && err == nil {
+			fail = fmt.Sprintf("got:\n%s\nwant:\n%s\n", g, e)
+		}
+		if fail != "" || err != nil {
+			fmt.Printf("--- FAIL: %s (%s)\n%s", eg.Name, dstr, fail)
+			ok = false
+		} else if *chatty {
+			fmt.Printf("--- PASS: %s (%s)\n", eg.Name, dstr)
+		}
+		if err != nil {
+			panic(err)
+		}
+	}()
+
+	// Run example.
+	eg.F()
+	return
+}