Retro68/gcc/libgo/go/testing/example.go
Wolfgang Thaller 6fbf4226da gcc-9.1
2019-06-20 20:10:10 +02:00

124 lines
2.5 KiB
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 (
"fmt"
"io"
"os"
"sort"
"strings"
"time"
)
type InternalExample struct {
Name string
F func()
Output string
Unordered bool
}
// An internal function but exported because it is cross-package; part of the implementation
// of the "go test" command.
func RunExamples(matchString func(pat, str string) (bool, error), examples []InternalExample) (ok bool) {
_, ok = runExamples(matchString, examples)
return ok
}
func runExamples(matchString func(pat, str string) (bool, error), examples []InternalExample) (ran, 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
}
ran = true
if !runExample(eg) {
ok = false
}
}
return ran, ok
}
func sortLines(output string) string {
lines := strings.Split(output, "\n")
sort.Strings(lines)
return strings.Join(lines, "\n")
}
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() {
var buf strings.Builder
_, 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.Since(start))
// Close pipe, restore stdout, get output.
w.Close()
os.Stdout = stdout
out := <-outC
var fail string
err := recover()
got := strings.TrimSpace(out)
want := strings.TrimSpace(eg.Output)
if eg.Unordered {
if sortLines(got) != sortLines(want) && err == nil {
fail = fmt.Sprintf("got:\n%s\nwant (unordered):\n%s\n", out, eg.Output)
}
} else {
if got != want && err == nil {
fail = fmt.Sprintf("got:\n%s\nwant:\n%s\n", got, want)
}
}
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
}