You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cmd_test.go
    path of file: ./repos/arvados/lib/recovercollection
    
    the code of the file until where you have to start completion: // Copyright (C) The Arvados Authors. All rights reserved.
//
// SPDX-License-Identifier: AGPL-3.0

package recovercollection

import (
	"bytes"
	"encoding/json"
	"io/ioutil"
	"os"
	"testing"
	"time"

	"git.arvados.org/arvados.git/lib/config"
	"git.arvados.org/arvados.git/sdk/go/arvadostest"
	"git.arvados.org/arvados.git/sdk/go/ctxlog"
	"gopkg.in/check.v1"
)

func Test(t *testing.T) {
	check.TestingT(t)
}

var _ = check.Suite(&Suite{})

type Suite struct{}

func (*Suite) SetUpSuite(c *check.C) {
	arvadostest.StartKeep(2, true)
}

func (*Suite) TestUnrecoverableBlock(c *check.C
    
func (*Suite) TestUntrashAndTouchBlock(c *check.C) {
	tmp := c.MkDir()
	mfile := tmp + "/manifest"
	ioutil.WriteFile(mfile, []byte(". dcd0348cb2532ee90c99f1b846efaee7+13 0:13:test.txt\n"), 0777)

	logger := ctxlog.TestLogger(c)
	loader := config.NewLoader(&bytes.Buffer{}, logger)
	cfg, err := loader.Load()
	c.Assert(err, check.IsNil)
	cluster, err := cfg.GetCluster("")
	c.Assert(err, check.IsNil)
	var datadirs []string
	for _, v := range cluster.Volumes {
		var params struct {
			Root string
		}
		err := json.Unmarshal(v.DriverParameters, &params)
		c.Assert(err, check.IsNil)
		if params.Root != "" {
			datadirs = append(datadirs, params.Root)
			err := os.Remove(params.Root + "/dcd/dcd0348cb2532ee90c99f1b846efaee7")
			if err != nil && !os.IsNotExist(err) {
				c.Error(err)
			}
		}
	}
	c.Logf("keepstore datadirs are %q", datadirs)

	// Currently StartKeep(2, true) uses dirs called "keep0" and
	// "keep1" so we could just put our fake trashed file in keep0
	// ... but we don't want to rely on arvadostest's
	// implementation details, so we put a trashed file in every
	// dir that keepstore might be using.
	for _, datadir := range datadirs {
		if fi, err := os.Stat(datadir); err != nil || !fi.IsDir() {
			continue
		}
		c.Logf("placing backdated trashed block in datadir %q", datadir)
		trashfile := datadir + "/dcd/dcd0348cb2532ee90c99f1b846efaee7.trash.999999999"
		os.Mkdir(datadir+"/dcd", 0777)
		err = ioutil.WriteFile(trashfile, []byte("undelete test"), 0777)
		c.Assert(err, check.IsNil)
		t := time.Now().Add(-time.Hour * 24 * 365)
		err = os.Chtimes(trashfile, t, t)
		c.Assert(err, check.IsNil)
	}

	var stdout, stderr bytes.Buffer
	exitcode := Command.RunCommand("recovercollection.test", []string{"-log-level=debug", mfile}, &bytes.Buffer{}, &stdout, &stderr)
	c.Check(exitcode, check.Equals, 0)
	c.Check(stdout.String(), check.Matches, `zzzzz-4zz18-.{15}\n`)
	c.Log(stderr.String())
	c.Check(stderr.String(), check.Matches, `(?ms).*msg=untrashed block=dcd0348.*`)
	c.Check(stderr.String(), check.Matches, `(?ms).*msg="updated timestamp" block=dcd0348.*`)

	found := false
	for _, datadir := range datadirs {
		buf, err := ioutil.ReadFile(datadir + "/dcd/dcd0348cb2532ee90c99f1b846efaee7")
		if err == nil {
			found = true
			c.Check(buf, check.DeepEquals, []byte("undelete test"))
			fi, err := os.Stat(datadir + "/dcd/dcd0348cb2532ee90c99f1b846efaee7")
			if c.Check(err, check.IsNil) {
				c.Logf("recovered block's modtime is %s", fi.ModTime())
				c.Check(time.Now().Sub(fi.ModTime()) < time.Hour, check.Equals, true)
			}
		}
	}
	c.Check(found, check.Equals, true)
}