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: index_parallel_test.go
    path of file: ./repos/restic/internal/index
    
    the code of the file until where you have to start completion: package index_test

import (
	"context"
	"path/filepath"
	"testing"

	"github.com/restic/restic/internal/errors"
	"github.com/restic/restic/internal/index"
	"github.com/restic/restic/internal/repository"
	"github.com/restic/restic/internal/restic"
	rtest "github.com/restic/restic/internal/test"
)

var repoFixture = filepath.Join("..", "repository", "testdata", "test-repo.tar.gz")

func TestRepositoryForAllIndexes(t *testing.T) {
	repodir, cleanup := rtest.Env(t, repoFixture)
	defer cleanup()

	repo := repository.TestOpenLocal(t, repodir)

	expectedIndexIDs := restic.NewIDSet()
	rtest.OK(t, repo.List(context.TODO(), restic.IndexFile, func(id restic.ID, size int
    
func TestRepositoryForAllIndexes(t *testing.T) {
	repodir, cleanup := rtest.Env(t, repoFixture)
	defer cleanup()

	repo := repository.TestOpenLocal(t, repodir)

	expectedIndexIDs := restic.NewIDSet()
	rtest.OK(t, repo.List(context.TODO(), restic.IndexFile, func(id restic.ID, size int64) error {
		expectedIndexIDs.Insert(id)
		return nil
	}))

	// check that all expected indexes are loaded without errors
	indexIDs := restic.NewIDSet()
	var indexErr error
	rtest.OK(t, index.ForAllIndexes(context.TODO(), repo, repo, func(id restic.ID, index *index.Index, oldFormat bool, err error) error {
		if err != nil {
			indexErr = err
		}
		indexIDs.Insert(id)
		return nil
	}))
	rtest.OK(t, indexErr)
	rtest.Equals(t, expectedIndexIDs, indexIDs)

	// must failed with the returned error
	iterErr := errors.New("error to pass upwards")

	err := index.ForAllIndexes(context.TODO(), repo, repo, func(id restic.ID, index *index.Index, oldFormat bool, err error) error {
		return iterErr
	})

	rtest.Equals(t, iterErr, err)
}