rclone/fs/walk/walk_test.go
Nick Craig-Wood efd720b533 walk: Implement walk.ListR which will use ListR if at all possible
It otherwise has the nearly the same interface as walk.Walk which it
will fall back to if it can't use ListR.

Using walk.ListR will speed up file system operations by default and
use much less memory and start immediately compared to if --fast-list
had been supplied.
2019-03-16 17:41:12 +00:00

943 lines
20 KiB
Go

package walk
import (
"fmt"
"io"
"strings"
"sync"
"testing"
"github.com/ncw/rclone/fs"
"github.com/ncw/rclone/fs/filter"
"github.com/ncw/rclone/fstest/mockdir"
"github.com/ncw/rclone/fstest/mockfs"
"github.com/ncw/rclone/fstest/mockobject"
"github.com/pkg/errors"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type (
listResult struct {
entries fs.DirEntries
err error
}
listResults map[string]listResult
errorMap map[string]error
listDirs struct {
mu sync.Mutex
t *testing.T
fs fs.Fs
includeAll bool
results listResults
walkResults listResults
walkErrors errorMap
finalError error
checkMaps bool
maxLevel int
}
)
func newListDirs(t *testing.T, f fs.Fs, includeAll bool, results listResults, walkErrors errorMap, finalError error) *listDirs {
return &listDirs{
t: t,
fs: f,
includeAll: includeAll,
results: results,
walkErrors: walkErrors,
walkResults: listResults{},
finalError: finalError,
checkMaps: true,
maxLevel: -1,
}
}
// NoCheckMaps marks the maps as to be ignored at the end
func (ls *listDirs) NoCheckMaps() *listDirs {
ls.checkMaps = false
return ls
}
// SetLevel(1) turns off recursion
func (ls *listDirs) SetLevel(maxLevel int) *listDirs {
ls.maxLevel = maxLevel
return ls
}
// ListDir returns the expected listing for the directory
func (ls *listDirs) ListDir(f fs.Fs, includeAll bool, dir string) (entries fs.DirEntries, err error) {
ls.mu.Lock()
defer ls.mu.Unlock()
assert.Equal(ls.t, ls.fs, f)
assert.Equal(ls.t, ls.includeAll, includeAll)
// Fetch results for this path
result, ok := ls.results[dir]
if !ok {
ls.t.Errorf("Unexpected list of %q", dir)
return nil, errors.New("unexpected list")
}
delete(ls.results, dir)
// Put expected results for call of WalkFn
ls.walkResults[dir] = result
return result.entries, result.err
}
// ListR returns the expected listing for the directory using ListR
func (ls *listDirs) ListR(dir string, callback fs.ListRCallback) (err error) {
ls.mu.Lock()
defer ls.mu.Unlock()
var errorReturn error
for dirPath, result := range ls.results {
// Put expected results for call of WalkFn
// Note that we don't call the function at all if we got an error
if result.err != nil {
errorReturn = result.err
}
if errorReturn == nil {
err = callback(result.entries)
require.NoError(ls.t, err)
ls.walkResults[dirPath] = result
}
}
ls.results = listResults{}
return errorReturn
}
// IsFinished checks everything expected was used up
func (ls *listDirs) IsFinished() {
if ls.checkMaps {
assert.Equal(ls.t, errorMap{}, ls.walkErrors)
assert.Equal(ls.t, listResults{}, ls.results)
assert.Equal(ls.t, listResults{}, ls.walkResults)
}
}
// WalkFn is called by the walk to test the expectations
func (ls *listDirs) WalkFn(dir string, entries fs.DirEntries, err error) error {
ls.mu.Lock()
defer ls.mu.Unlock()
// ls.t.Logf("WalkFn(%q, %v, %q)", dir, entries, err)
// Fetch expected entries and err
result, ok := ls.walkResults[dir]
if !ok {
ls.t.Errorf("Unexpected walk of %q (result not found)", dir)
return errors.New("result not found")
}
delete(ls.walkResults, dir)
// Check arguments are as expected
assert.Equal(ls.t, result.entries, entries)
assert.Equal(ls.t, result.err, err)
// Fetch return value
returnErr, ok := ls.walkErrors[dir]
if !ok {
ls.t.Errorf("Unexpected walk of %q (error not found)", dir)
return errors.New("error not found")
}
delete(ls.walkErrors, dir)
return returnErr
}
// Walk does the walk and tests the expectations
func (ls *listDirs) Walk() {
err := walk(nil, "", ls.includeAll, ls.maxLevel, ls.WalkFn, ls.ListDir)
assert.Equal(ls.t, ls.finalError, err)
ls.IsFinished()
}
// WalkR does the walkR and tests the expectations
func (ls *listDirs) WalkR() {
err := walkR(nil, "", ls.includeAll, ls.maxLevel, ls.WalkFn, ls.ListR)
assert.Equal(ls.t, ls.finalError, err)
if ls.finalError == nil {
ls.IsFinished()
}
}
func testWalkEmpty(t *testing.T) *listDirs {
return newListDirs(t, nil, false,
listResults{
"": {entries: fs.DirEntries{}, err: nil},
},
errorMap{
"": nil,
},
nil,
)
}
func TestWalkEmpty(t *testing.T) { testWalkEmpty(t).Walk() }
func TestWalkREmpty(t *testing.T) { testWalkEmpty(t).WalkR() }
func testWalkEmptySkip(t *testing.T) *listDirs {
return newListDirs(t, nil, true,
listResults{
"": {entries: fs.DirEntries{}, err: nil},
},
errorMap{
"": ErrorSkipDir,
},
nil,
)
}
func TestWalkEmptySkip(t *testing.T) { testWalkEmptySkip(t).Walk() }
func TestWalkREmptySkip(t *testing.T) { testWalkEmptySkip(t).WalkR() }
func testWalkNotFound(t *testing.T) *listDirs {
return newListDirs(t, nil, true,
listResults{
"": {err: fs.ErrorDirNotFound},
},
errorMap{
"": fs.ErrorDirNotFound,
},
fs.ErrorDirNotFound,
)
}
func TestWalkNotFound(t *testing.T) { testWalkNotFound(t).Walk() }
func TestWalkRNotFound(t *testing.T) { testWalkNotFound(t).WalkR() }
func TestWalkNotFoundMaskError(t *testing.T) {
// this doesn't work for WalkR
newListDirs(t, nil, true,
listResults{
"": {err: fs.ErrorDirNotFound},
},
errorMap{
"": nil,
},
nil,
).Walk()
}
func TestWalkNotFoundSkipkError(t *testing.T) {
// this doesn't work for WalkR
newListDirs(t, nil, true,
listResults{
"": {err: fs.ErrorDirNotFound},
},
errorMap{
"": ErrorSkipDir,
},
nil,
).Walk()
}
func testWalkLevels(t *testing.T, maxLevel int) *listDirs {
da := mockdir.New("a")
oA := mockobject.Object("A")
db := mockdir.New("a/b")
oB := mockobject.Object("a/B")
dc := mockdir.New("a/b/c")
oC := mockobject.Object("a/b/C")
dd := mockdir.New("a/b/c/d")
oD := mockobject.Object("a/b/c/D")
return newListDirs(t, nil, false,
listResults{
"": {entries: fs.DirEntries{oA, da}, err: nil},
"a": {entries: fs.DirEntries{oB, db}, err: nil},
"a/b": {entries: fs.DirEntries{oC, dc}, err: nil},
"a/b/c": {entries: fs.DirEntries{oD, dd}, err: nil},
"a/b/c/d": {entries: fs.DirEntries{}, err: nil},
},
errorMap{
"": nil,
"a": nil,
"a/b": nil,
"a/b/c": nil,
"a/b/c/d": nil,
},
nil,
).SetLevel(maxLevel)
}
func TestWalkLevels(t *testing.T) { testWalkLevels(t, -1).Walk() }
func TestWalkRLevels(t *testing.T) { testWalkLevels(t, -1).WalkR() }
func TestWalkLevelsNoRecursive10(t *testing.T) { testWalkLevels(t, 10).Walk() }
func TestWalkRLevelsNoRecursive10(t *testing.T) { testWalkLevels(t, 10).WalkR() }
func TestWalkNDirTree(t *testing.T) {
ls := testWalkLevels(t, -1)
entries, err := walkNDirTree(nil, "", ls.includeAll, ls.maxLevel, ls.ListDir)
require.NoError(t, err)
assert.Equal(t, `/
A
a/
a/
B
b/
a/b/
C
c/
a/b/c/
D
d/
a/b/c/d/
`, entries.String())
}
func testWalkLevelsNoRecursive(t *testing.T) *listDirs {
da := mockdir.New("a")
oA := mockobject.Object("A")
return newListDirs(t, nil, false,
listResults{
"": {entries: fs.DirEntries{oA, da}, err: nil},
},
errorMap{
"": nil,
},
nil,
).SetLevel(1)
}
func TestWalkLevelsNoRecursive(t *testing.T) { testWalkLevelsNoRecursive(t).Walk() }
func TestWalkRLevelsNoRecursive(t *testing.T) { testWalkLevelsNoRecursive(t).WalkR() }
func testWalkLevels2(t *testing.T) *listDirs {
da := mockdir.New("a")
oA := mockobject.Object("A")
db := mockdir.New("a/b")
oB := mockobject.Object("a/B")
return newListDirs(t, nil, false,
listResults{
"": {entries: fs.DirEntries{oA, da}, err: nil},
"a": {entries: fs.DirEntries{oB, db}, err: nil},
},
errorMap{
"": nil,
"a": nil,
},
nil,
).SetLevel(2)
}
func TestWalkLevels2(t *testing.T) { testWalkLevels2(t).Walk() }
func TestWalkRLevels2(t *testing.T) { testWalkLevels2(t).WalkR() }
func testWalkSkip(t *testing.T) *listDirs {
da := mockdir.New("a")
db := mockdir.New("a/b")
dc := mockdir.New("a/b/c")
return newListDirs(t, nil, false,
listResults{
"": {entries: fs.DirEntries{da}, err: nil},
"a": {entries: fs.DirEntries{db}, err: nil},
"a/b": {entries: fs.DirEntries{dc}, err: nil},
},
errorMap{
"": nil,
"a": nil,
"a/b": ErrorSkipDir,
},
nil,
)
}
func TestWalkSkip(t *testing.T) { testWalkSkip(t).Walk() }
func TestWalkRSkip(t *testing.T) { testWalkSkip(t).WalkR() }
func testWalkErrors(t *testing.T) *listDirs {
lr := listResults{}
em := errorMap{}
de := make(fs.DirEntries, 10)
for i := range de {
path := string('0' + i)
de[i] = mockdir.New(path)
lr[path] = listResult{entries: nil, err: fs.ErrorDirNotFound}
em[path] = fs.ErrorDirNotFound
}
lr[""] = listResult{entries: de, err: nil}
em[""] = nil
return newListDirs(t, nil, true,
lr,
em,
fs.ErrorDirNotFound,
).NoCheckMaps()
}
func TestWalkErrors(t *testing.T) { testWalkErrors(t).Walk() }
func TestWalkRErrors(t *testing.T) { testWalkErrors(t).WalkR() }
var errorBoom = errors.New("boom")
func makeTree(level int, terminalErrors bool) (listResults, errorMap) {
lr := listResults{}
em := errorMap{}
var fill func(path string, level int)
fill = func(path string, level int) {
de := fs.DirEntries{}
if level > 0 {
for _, a := range "0123456789" {
subPath := string(a)
if path != "" {
subPath = path + "/" + subPath
}
de = append(de, mockdir.New(subPath))
fill(subPath, level-1)
}
}
lr[path] = listResult{entries: de, err: nil}
em[path] = nil
if level == 0 && terminalErrors {
em[path] = errorBoom
}
}
fill("", level)
return lr, em
}
func testWalkMulti(t *testing.T) *listDirs {
lr, em := makeTree(3, false)
return newListDirs(t, nil, true,
lr,
em,
nil,
)
}
func TestWalkMulti(t *testing.T) { testWalkMulti(t).Walk() }
func TestWalkRMulti(t *testing.T) { testWalkMulti(t).WalkR() }
func testWalkMultiErrors(t *testing.T) *listDirs {
lr, em := makeTree(3, true)
return newListDirs(t, nil, true,
lr,
em,
errorBoom,
).NoCheckMaps()
}
func TestWalkMultiErrors(t *testing.T) { testWalkMultiErrors(t).Walk() }
func TestWalkRMultiErrors(t *testing.T) { testWalkMultiErrors(t).Walk() }
// a very simple listRcallback function
func makeListRCallback(entries fs.DirEntries, err error) fs.ListRFn {
return func(dir string, callback fs.ListRCallback) error {
if err == nil {
err = callback(entries)
}
return err
}
}
func TestWalkRDirTree(t *testing.T) {
for _, test := range []struct {
entries fs.DirEntries
want string
err error
root string
level int
}{
{fs.DirEntries{}, "/\n", nil, "", -1},
{fs.DirEntries{mockobject.Object("a")}, `/
a
`, nil, "", -1},
{fs.DirEntries{mockobject.Object("a/b")}, `/
a/
a/
b
`, nil, "", -1},
{fs.DirEntries{mockobject.Object("a/b/c/d")}, `/
a/
a/
b/
a/b/
c/
a/b/c/
d
`, nil, "", -1},
{fs.DirEntries{mockobject.Object("a")}, "", errorBoom, "", -1},
{fs.DirEntries{
mockobject.Object("0/1/2/3"),
mockobject.Object("4/5/6/7"),
mockobject.Object("8/9/a/b"),
mockobject.Object("c/d/e/f"),
mockobject.Object("g/h/i/j"),
mockobject.Object("k/l/m/n"),
mockobject.Object("o/p/q/r"),
mockobject.Object("s/t/u/v"),
mockobject.Object("w/x/y/z"),
}, `/
0/
4/
8/
c/
g/
k/
o/
s/
w/
0/
1/
0/1/
2/
0/1/2/
3
4/
5/
4/5/
6/
4/5/6/
7
8/
9/
8/9/
a/
8/9/a/
b
c/
d/
c/d/
e/
c/d/e/
f
g/
h/
g/h/
i/
g/h/i/
j
k/
l/
k/l/
m/
k/l/m/
n
o/
p/
o/p/
q/
o/p/q/
r
s/
t/
s/t/
u/
s/t/u/
v
w/
x/
w/x/
y/
w/x/y/
z
`, nil, "", -1},
{fs.DirEntries{
mockobject.Object("a/b/c/d/e/f1"),
mockobject.Object("a/b/c/d/e/f2"),
mockobject.Object("a/b/c/d/e/f3"),
}, `a/b/c/
d/
a/b/c/d/
e/
a/b/c/d/e/
f1
f2
f3
`, nil, "a/b/c", -1},
{fs.DirEntries{
mockobject.Object("A"),
mockobject.Object("a/B"),
mockobject.Object("a/b/C"),
mockobject.Object("a/b/c/D"),
mockobject.Object("a/b/c/d/E"),
}, `/
A
a/
a/
B
b/
`, nil, "", 2},
{fs.DirEntries{
mockobject.Object("a/b/c"),
mockobject.Object("a/b/c/d/e"),
}, `/
a/
a/
b/
`, nil, "", 2},
} {
r, err := walkRDirTree(nil, test.root, true, test.level, makeListRCallback(test.entries, test.err))
assert.Equal(t, test.err, err, fmt.Sprintf("%+v", test))
assert.Equal(t, test.want, r.String(), fmt.Sprintf("%+v", test))
}
}
func TestWalkRDirTreeExclude(t *testing.T) {
for _, test := range []struct {
entries fs.DirEntries
want string
err error
root string
level int
excludeFile string
includeAll bool
}{
{fs.DirEntries{mockobject.Object("a"), mockobject.Object("ignore")}, "", nil, "", -1, "ignore", false},
{fs.DirEntries{mockobject.Object("a")}, `/
a
`, nil, "", -1, "ignore", false},
{fs.DirEntries{
mockobject.Object("a"),
mockobject.Object("b/b"),
mockobject.Object("b/.ignore"),
}, `/
a
`, nil, "", -1, ".ignore", false},
{fs.DirEntries{
mockobject.Object("a"),
mockobject.Object("b/.ignore"),
mockobject.Object("b/b"),
}, `/
a
b/
b/
.ignore
b
`, nil, "", -1, ".ignore", true},
{fs.DirEntries{
mockobject.Object("a"),
mockobject.Object("b/b"),
mockobject.Object("b/c/d/e"),
mockobject.Object("b/c/ign"),
mockobject.Object("b/c/x"),
}, `/
a
b/
b/
b
`, nil, "", -1, "ign", false},
{fs.DirEntries{
mockobject.Object("a"),
mockobject.Object("b/b"),
mockobject.Object("b/c/d/e"),
mockobject.Object("b/c/ign"),
mockobject.Object("b/c/x"),
}, `/
a
b/
b/
b
c/
b/c/
d/
ign
x
b/c/d/
e
`, nil, "", -1, "ign", true},
} {
filter.Active.Opt.ExcludeFile = test.excludeFile
r, err := walkRDirTree(nil, test.root, test.includeAll, test.level, makeListRCallback(test.entries, test.err))
assert.Equal(t, test.err, err, fmt.Sprintf("%+v", test))
assert.Equal(t, test.want, r.String(), fmt.Sprintf("%+v", test))
}
// Set to default value, to avoid side effects
filter.Active.Opt.ExcludeFile = ""
}
func TestListType(t *testing.T) {
assert.Equal(t, true, ListObjects.Objects())
assert.Equal(t, false, ListObjects.Dirs())
assert.Equal(t, false, ListDirs.Objects())
assert.Equal(t, true, ListDirs.Dirs())
assert.Equal(t, true, ListAll.Objects())
assert.Equal(t, true, ListAll.Dirs())
var (
a = mockobject.Object("a")
b = mockobject.Object("b")
dir = mockdir.New("dir")
adir = mockobject.Object("dir/a")
dir2 = mockdir.New("dir2")
origEntries = fs.DirEntries{
a, b, dir, adir, dir2,
}
dirEntries = fs.DirEntries{
dir, dir2,
}
objEntries = fs.DirEntries{
a, b, adir,
}
)
copyOrigEntries := func() (out fs.DirEntries) {
out = make(fs.DirEntries, len(origEntries))
copy(out, origEntries)
return out
}
got := copyOrigEntries()
ListAll.Filter(&got)
assert.Equal(t, origEntries, got)
got = copyOrigEntries()
ListObjects.Filter(&got)
assert.Equal(t, objEntries, got)
got = copyOrigEntries()
ListDirs.Filter(&got)
assert.Equal(t, dirEntries, got)
}
func TestListR(t *testing.T) {
objects := fs.DirEntries{
mockobject.Object("a"),
mockobject.Object("b"),
mockdir.New("dir"),
mockobject.Object("dir/a"),
mockobject.Object("dir/b"),
mockobject.Object("dir/c"),
}
f := mockfs.NewFs("mock", "/")
var got []string
clearCallback := func() {
got = nil
}
callback := func(entries fs.DirEntries) error {
for _, entry := range entries {
got = append(got, entry.Remote())
}
return nil
}
doListR := func(dir string, callback fs.ListRCallback) error {
var os fs.DirEntries
for _, o := range objects {
if dir == "" || strings.HasPrefix(o.Remote(), dir+"/") {
os = append(os, o)
}
}
return callback(os)
}
// Setup filter
oldFilter := filter.Active
defer func() {
filter.Active = oldFilter
}()
var err error
filter.Active, err = filter.NewFilter(nil)
require.NoError(t, err)
require.NoError(t, filter.Active.AddRule("+ b"))
require.NoError(t, filter.Active.AddRule("- *"))
// Base case
clearCallback()
err = listR(f, "", true, ListAll, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"a", "b", "dir", "dir/a", "dir/b", "dir/c"}, got)
// Base case - with Objects
clearCallback()
err = listR(f, "", true, ListObjects, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"a", "b", "dir/a", "dir/b", "dir/c"}, got)
// Base case - with Dirs
clearCallback()
err = listR(f, "", true, ListDirs, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"dir"}, got)
// With filter
clearCallback()
err = listR(f, "", false, ListAll, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"b", "dir", "dir/b"}, got)
// With filter - with Objects
clearCallback()
err = listR(f, "", false, ListObjects, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"b", "dir/b"}, got)
// With filter - with Dir
clearCallback()
err = listR(f, "", false, ListDirs, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"dir"}, got)
// With filter and subdir
clearCallback()
err = listR(f, "dir", false, ListAll, callback, doListR, false)
require.NoError(t, err)
require.Equal(t, []string{"dir/b"}, got)
// Now bucket based
objects = fs.DirEntries{
mockobject.Object("a"),
mockobject.Object("b"),
mockobject.Object("dir/a"),
mockobject.Object("dir/b"),
mockobject.Object("dir/subdir/c"),
mockdir.New("dir/subdir"),
}
// Base case
clearCallback()
err = listR(f, "", true, ListAll, callback, doListR, true)
require.NoError(t, err)
require.Equal(t, []string{"a", "b", "dir/a", "dir/b", "dir/subdir/c", "dir/subdir", "dir"}, got)
// With filter
clearCallback()
err = listR(f, "", false, ListAll, callback, doListR, true)
require.NoError(t, err)
require.Equal(t, []string{"b", "dir/b", "dir/subdir", "dir"}, got)
// With filter and subdir
clearCallback()
err = listR(f, "dir", false, ListAll, callback, doListR, true)
require.NoError(t, err)
require.Equal(t, []string{"dir/b", "dir/subdir"}, got)
// With filter and subdir - with Objects
clearCallback()
err = listR(f, "dir", false, ListObjects, callback, doListR, true)
require.NoError(t, err)
require.Equal(t, []string{"dir/b"}, got)
// With filter and subdir - with Dirs
clearCallback()
err = listR(f, "dir", false, ListDirs, callback, doListR, true)
require.NoError(t, err)
require.Equal(t, []string{"dir/subdir"}, got)
}
func TestDirMapAdd(t *testing.T) {
type add struct {
dir string
sent bool
}
for i, test := range []struct {
root string
in []add
want map[string]bool
}{
{
root: "",
in: []add{
{"", true},
},
want: map[string]bool{},
},
{
root: "",
in: []add{
{"a/b/c", true},
},
want: map[string]bool{
"a/b/c": true,
"a/b": false,
"a": false,
},
},
{
root: "",
in: []add{
{"a/b/c", true},
{"a/b", true},
},
want: map[string]bool{
"a/b/c": true,
"a/b": true,
"a": false,
},
},
{
root: "",
in: []add{
{"a/b", true},
{"a/b/c", false},
},
want: map[string]bool{
"a/b/c": false,
"a/b": true,
"a": false,
},
},
{
root: "root",
in: []add{
{"root/a/b", true},
{"root/a/b/c", false},
},
want: map[string]bool{
"root/a/b/c": false,
"root/a/b": true,
"root/a": false,
},
},
} {
t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
dm := newDirMap(test.root)
for _, item := range test.in {
dm.add(item.dir, item.sent)
}
assert.Equal(t, test.want, dm.m)
})
}
}
func TestDirMapAddEntries(t *testing.T) {
dm := newDirMap("")
entries := fs.DirEntries{
mockobject.Object("dir/a"),
mockobject.Object("dir/b"),
mockdir.New("dir"),
mockobject.Object("dir2/a"),
mockobject.Object("dir2/b"),
}
require.NoError(t, dm.addEntries(entries))
assert.Equal(t, map[string]bool{"dir": true, "dir2": false}, dm.m)
}
func TestDirMapSendEntries(t *testing.T) {
var got []string
clearCallback := func() {
got = nil
}
callback := func(entries fs.DirEntries) error {
for _, entry := range entries {
got = append(got, entry.Remote())
}
return nil
}
// general test
dm := newDirMap("")
entries := fs.DirEntries{
mockobject.Object("dir/a"),
mockobject.Object("dir/b"),
mockdir.New("dir"),
mockobject.Object("dir2/a"),
mockobject.Object("dir2/b"),
mockobject.Object("dir1/a"),
mockobject.Object("dir3/b"),
}
require.NoError(t, dm.addEntries(entries))
clearCallback()
err := dm.sendEntries(callback)
require.NoError(t, err)
assert.Equal(t, []string{
"dir1",
"dir2",
"dir3",
}, got)
// return error from callback
callback2 := func(entries fs.DirEntries) error {
return io.EOF
}
err = dm.sendEntries(callback2)
require.Equal(t, io.EOF, err)
// empty
dm = newDirMap("")
clearCallback()
err = dm.sendEntries(callback)
require.NoError(t, err)
assert.Equal(t, []string(nil), got)
}