// run runs a test.
run runs a test.
// run runs a test .
func (t *test) run() {
	defer close(t.donec)
	srcBytes, err := ioutil.ReadFile(t.goFileName())
	if err != nil {
		t.err = err
		return
	}
	t.src = string(srcBytes)
	if t.src[0] == '\n' {
		t.err = skipError("starts with newline")
		return
	}
	pos := strings.Index(t.src, "\n\n")
	if pos == -1 {
		t.err = errors.New("double newline not found")
		return
	}
	action := t.src[:pos]
	if strings.HasPrefix(action, "//") {
		action = action[2:]
	}
	var args []string
	f := strings.Fields(action)
	if len(f) > 0 {
		action = f[0]
		args = f[1:]
	}
	switch action {
	case "cmpout":
		action = "run" 
		fallthrough
	case "compile", "build", "run", "errorcheck":
		t.action = action
	case "skip":
		t.action = "skip"
		return
	default:
		t.err = skipError("skipped; unknown pattern: " + action)
		t.action = "??"
		return
	}
	t.makeTempDir()
	defer os.RemoveAll(t.tempDir)
	err = ioutil.WriteFile(filepath.Join(t.tempDir, t.gofile), srcBytes, 0644)
	check(err)
	os.Setenv("GOOS", runtime.GOOS)
	os.Setenv("GOARCH", runtime.GOARCH)
	useTmp := true
	runcmd := func(args ...string) ([]byte, error) {
		cmd := exec.Command(args[0], args[1:]...)
		var buf bytes.Buffer
		cmd.Stdout = &buf
		cmd.Stderr = &buf
		if useTmp {
			cmd.Dir = t.tempDir
		}
		err := cmd.Run()
		return buf.Bytes(), err
	}
	long := filepath.Join(cwd, t.goFileName())
	switch action {
	default:
		t.err = fmt.Errorf("unimplemented action %q", action)
	case "errorcheck":
		out, _ := runcmd("go", "tool", gc, "-e", "-o", "a."+letter, long)
		t.err = t.errorCheck(string(out), long, t.gofile)
		return
	case "compile":
		out, err := runcmd("go", "tool", gc, "-e", "-o", "a."+letter, long)
		if err != nil {
			t.err = fmt.Errorf("%s\n%s", err, out)
		}
	case "build":
		out, err := runcmd("go", "build", "-o", "a.exe", long)
		if err != nil {
			t.err = fmt.Errorf("%s\n%s", err, out)
		}
	case "run":
		useTmp = false
		out, err := runcmd(append([]string{"go", "run", t.goFileName()}, args...)...)
		if err != nil {
			t.err = fmt.Errorf("%s\n%s", err, out)
		}
		if string(out) != t.expectedOutput() {
			t.err = fmt.Errorf("incorrect output\n%s", out)
		}
	}
}
func ( t * test ) run ( ) { defer close ( t . donec ) srcBytes , err := ioutil . ReadFile ( t . goFileName ( ) ) if err != nil { t . err = err return } t . src = string ( srcBytes ) if t . src [ 0 ] == '\n' { t . err = skipError ( " " ) return } pos := strings . Index ( t . src , " \n \n " ) if pos == - 1 { t . err = errors . New ( " " ) return } action := t . src [ : pos ] if strings . HasPrefix ( action , " " ) { action = action [ 2 : ] } var args [ ] string f := strings . Fields ( action ) if len ( f ) > 0 { action = f [ 0 ] args = f [ 1 : ] } switch action { case " " : action = " " fallthrough case " " , " " , " " , " " : t . action = action case " " : t . action = " " return default : t . err = skipError ( " " + action ) t . action = " " return } t . makeTempDir ( ) defer os . RemoveAll ( t . tempDir ) err = ioutil . WriteFile ( filepath . Join ( t . tempDir , t . gofile ) , srcBytes , 0644 ) check ( err ) os . Setenv ( " " , runtime . GOOS ) os . Setenv ( " " , runtime . GOARCH ) useTmp := true runcmd := func ( args ... string ) ( [ ] byte , error ) { cmd := exec . Command ( args [ 0 ] , args [ 1 : ] ... ) var buf bytes . Buffer cmd . Stdout = & buf cmd . Stderr = & buf if useTmp { cmd . Dir = t . tempDir } err := cmd . Run ( ) return buf . Bytes ( ) , err } long := filepath . Join ( cwd , t . goFileName ( ) ) switch action { default : t . err = fmt . Errorf ( " " , action ) case " " : out , _ := runcmd ( " " , " " , gc , " " , " " , " " + letter , long ) t . err = t . errorCheck ( string ( out ) , long , t . gofile ) return case " " : out , err := runcmd ( " " , " " , gc , " " , " " , " " + letter , long ) if err != nil { t . err = fmt . Errorf ( " \n " , err , out ) } case " " : out , err := runcmd ( " " , " " , " " , " " , long ) if err != nil { t . err = fmt . Errorf ( " \n " , err , out ) } case " " : useTmp = false out , err := runcmd ( append ( [ ] string { " " , " " , t . goFileName ( ) } , args ... ) ... ) if err != nil { t . err = fmt . Errorf ( " \n " , err , out ) } if string ( out ) != t . expectedOutput ( ) { t . err = fmt . Errorf ( " \n " , out ) } } }
run runs a test.
run runs a test .
// the run case already looks for <dir>/<test>.out files // A few tests (of things like the environment) require these to be set.