/*	Help for testing commands*/package test import (	"bytes"	"clive/dbg"	"clive/zx/fstest"	"os"	"os/exec"	"strings"	"testing") struct Run {	Line     string	Out, Err string	Fails    bool	Ok       bool // if set, out, err and fails are ignored} var tdir = "/tmp/cmdtest" func Cmds(t *testing.T, runs []Run) {	for _, r := range runs {		o, e, fails := Cmd(t, r.Line)		if r.Ok {			continue		}		if fails {			if !r.Fails {				t.Fatal("command did fail")			}		} else {			if r.Fails {				t.Fatal("command didn't fail")			}		}		if strings.TrimSpace(r.Out) != strings.TrimSpace(o) {			t.Fatal("bad output")		}		if strings.TrimSpace(r.Err) != strings.TrimSpace(e) {			t.Fatal("bad error output")		}	}} // Installs the command, for use before running the tests.func InstallCmd(t *testing.T) {	x := exec.Command("go", "install", "-v")	if err := x.Run(); err != nil {		t.Fatal(err)	}} // Run cmd and make sure that the out and err streams are as given.// The command runs at /tmp/cmdtest where zx/fstest.MkTree has created// our usual file testing tree, in case the command needs input.// It is run using "sh -c 'cd /tmp/cmdtest; <cmd>' ".// go install is run before running the command.func Cmd(t *testing.T, cmd string) (cout, cerr string, fails bool) {	os.RemoveAll(tdir)	fstest.MkTree(t, tdir)	defer os.RemoveAll(tdir)	var bout, berr bytes.Buffer	if testing.Verbose() {		dbg.Printf("run %s\n", cmd)	}	x := exec.Command("sh", "-c", "cd "+tdir+"; unset dot ; "+cmd)	x.Stdout = &bout	x.Stderr = &berr	if err := x.Start(); err != nil {		t.Fatal(err)	}	if err := x.Wait(); err != nil {		fails = true	}	cout = bout.String()	cerr = berr.String()	if testing.Verbose() {		dbg.Printf("out <%s>\n", cout)		dbg.Printf("err <%s>\n", cerr)	}	return cout, cerr, fails}