// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package testing
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import (
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"fmt"
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"io"
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"os"
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"sort"
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"strings"
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"time"
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)
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type InternalExample struct {
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Name string
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F func()
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Output string
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Unordered bool
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}
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// An internal function but exported because it is cross-package; part of the implementation
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// of the "go test" command.
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func RunExamples(matchString func(pat, str string) (bool, error), examples []InternalExample) (ok bool) {
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_, ok = runExamples(matchString, examples)
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return ok
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}
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func runExamples(matchString func(pat, str string) (bool, error), examples []InternalExample) (ran, ok bool) {
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ok = true
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var eg InternalExample
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for _, eg = range examples {
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matched, err := matchString(*match, eg.Name)
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if err != nil {
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fmt.Fprintf(os.Stderr, "testing: invalid regexp for -test.run: %s\n", err)
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os.Exit(1)
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}
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if !matched {
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continue
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}
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ran = true
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if !runExample(eg) {
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ok = false
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}
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}
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return ran, ok
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}
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func sortLines(output string) string {
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lines := strings.Split(output, "\n")
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sort.Strings(lines)
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return strings.Join(lines, "\n")
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}
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func runExample(eg InternalExample) (ok bool) {
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if *chatty {
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fmt.Printf("=== RUN %s\n", eg.Name)
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}
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// Capture stdout.
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stdout := os.Stdout
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r, w, err := os.Pipe()
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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os.Stdout = w
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outC := make(chan string)
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go func() {
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var buf strings.Builder
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_, err := io.Copy(&buf, r)
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r.Close()
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if err != nil {
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fmt.Fprintf(os.Stderr, "testing: copying pipe: %v\n", err)
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os.Exit(1)
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}
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outC <- buf.String()
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}()
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start := time.Now()
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ok = true
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// Clean up in a deferred call so we can recover if the example panics.
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defer func() {
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dstr := fmtDuration(time.Since(start))
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// Close pipe, restore stdout, get output.
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w.Close()
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os.Stdout = stdout
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out := <-outC
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var fail string
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err := recover()
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got := strings.TrimSpace(out)
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want := strings.TrimSpace(eg.Output)
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if eg.Unordered {
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if sortLines(got) != sortLines(want) && err == nil {
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fail = fmt.Sprintf("got:\n%s\nwant (unordered):\n%s\n", out, eg.Output)
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}
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} else {
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if got != want && err == nil {
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fail = fmt.Sprintf("got:\n%s\nwant:\n%s\n", got, want)
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}
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}
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if fail != "" || err != nil {
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fmt.Printf("--- FAIL: %s (%s)\n%s", eg.Name, dstr, fail)
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ok = false
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} else if *chatty {
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fmt.Printf("--- PASS: %s (%s)\n", eg.Name, dstr)
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}
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if err != nil {
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panic(err)
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}
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}()
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// Run example.
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eg.F()
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return
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}
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