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// 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 exec
import (
"bufio"
"bytes"
"fmt"
"io"
"testing"
"os"
"strconv"
"strings"
)
func helperCommand(s ...string) *Cmd {
cs := []string{"-test.run=exec.TestHelperProcess", "--"}
cs = append(cs, s...)
cmd := Command(os.Args[0], cs...)
cmd.Env = append([]string{"GO_WANT_HELPER_PROCESS=1"}, os.Environ()...)
return cmd
}
func TestEcho(t *testing.T) {
bs, err := helperCommand("echo", "foo bar", "baz").Output()
if err != nil {
t.Errorf("echo: %v", err)
}
if g, e := string(bs), "foo bar baz\n"; g != e {
t.Errorf("echo: want %q, got %q", e, g)
}
}
func TestCatStdin(t *testing.T) {
// Cat, testing stdin and stdout.
input := "Input string\nLine 2"
p := helperCommand("cat")
p.Stdin = strings.NewReader(input)
bs, err := p.Output()
if err != nil {
t.Errorf("cat: %v", err)
}
s := string(bs)
if s != input {
t.Errorf("cat: want %q, got %q", input, s)
}
}
func TestCatGoodAndBadFile(t *testing.T) {
// Testing combined output and error values.
bs, err := helperCommand("cat", "/bogus/file.foo", "exec_test.go").CombinedOutput()
if _, ok := err.(*os.Waitmsg); !ok {
t.Errorf("expected Waitmsg from cat combined; got %T: %v", err, err)
}
s := string(bs)
sp := strings.SplitN(s, "\n", 2)
if len(sp) != 2 {
t.Fatalf("expected two lines from cat; got %q", s)
}
errLine, body := sp[0], sp[1]
if !strings.HasPrefix(errLine, "Error: open /bogus/file.foo") {
t.Errorf("expected stderr to complain about file; got %q", errLine)
}
if !strings.Contains(body, "func TestHelperProcess(t *testing.T)") {
t.Errorf("expected test code; got %q (len %d)", body, len(body))
}
}
func TestNoExistBinary(t *testing.T) {
// Can't run a non-existent binary
err := Command("/no-exist-binary").Run()
if err == nil {
t.Error("expected error from /no-exist-binary")
}
}
func TestExitStatus(t *testing.T) {
// Test that exit values are returned correctly
err := helperCommand("exit", "42").Run()
if werr, ok := err.(*os.Waitmsg); ok {
if s, e := werr.String(), "exit status 42"; s != e {
t.Errorf("from exit 42 got exit %q, want %q", s, e)
}
} else {
t.Fatalf("expected Waitmsg from exit 42; got %T: %v", err, err)
}
}
func TestPipes(t *testing.T) {
check := func(what string, err os.Error) {
if err != nil {
t.Fatalf("%s: %v", what, err)
}
}
// Cat, testing stdin and stdout.
c := helperCommand("pipetest")
stdin, err := c.StdinPipe()
check("StdinPipe", err)
stdout, err := c.StdoutPipe()
check("StdoutPipe", err)
stderr, err := c.StderrPipe()
check("StderrPipe", err)
outbr := bufio.NewReader(stdout)
errbr := bufio.NewReader(stderr)
line := func(what string, br *bufio.Reader) string {
line, _, err := br.ReadLine()
if err != nil {
t.Fatalf("%s: %v", what, err)
}
return string(line)
}
err = c.Start()
check("Start", err)
_, err = stdin.Write([]byte("O:I am output\n"))
check("first stdin Write", err)
if g, e := line("first output line", outbr), "O:I am output"; g != e {
t.Errorf("got %q, want %q", g, e)
}
_, err = stdin.Write([]byte("E:I am error\n"))
check("second stdin Write", err)
if g, e := line("first error line", errbr), "E:I am error"; g != e {
t.Errorf("got %q, want %q", g, e)
}
_, err = stdin.Write([]byte("O:I am output2\n"))
check("third stdin Write 3", err)
if g, e := line("second output line", outbr), "O:I am output2"; g != e {
t.Errorf("got %q, want %q", g, e)
}
stdin.Close()
err = c.Wait()
check("Wait", err)
}
// TestHelperProcess isn't a real test. It's used as a helper process
// for TestParameterRun.
func TestHelperProcess(*testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
return
}
defer os.Exit(0)
args := os.Args
for len(args) > 0 {
if args[0] == "--" {
args = args[1:]
break
}
args = args[1:]
}
if len(args) == 0 {
fmt.Fprintf(os.Stderr, "No command\n")
os.Exit(2)
}
cmd, args := args[0], args[1:]
switch cmd {
case "echo":
iargs := []interface{}{}
for _, s := range args {
iargs = append(iargs, s)
}
fmt.Println(iargs...)
case "cat":
if len(args) == 0 {
io.Copy(os.Stdout, os.Stdin)
return
}
exit := 0
for _, fn := range args {
f, err := os.Open(fn)
if err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
exit = 2
} else {
defer f.Close()
io.Copy(os.Stdout, f)
}
}
os.Exit(exit)
case "pipetest":
bufr := bufio.NewReader(os.Stdin)
for {
line, _, err := bufr.ReadLine()
if err == os.EOF {
break
} else if err != nil {
os.Exit(1)
}
if bytes.HasPrefix(line, []byte("O:")) {
os.Stdout.Write(line)
os.Stdout.Write([]byte{'\n'})
} else if bytes.HasPrefix(line, []byte("E:")) {
os.Stderr.Write(line)
os.Stderr.Write([]byte{'\n'})
} else {
os.Exit(1)
}
}
case "exit":
n, _ := strconv.Atoi(args[0])
os.Exit(n)
default:
fmt.Fprintf(os.Stderr, "Unknown command %q\n", cmd)
os.Exit(2)
}
}
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