blob: 079d060ed3323cf0be0b90407e63e0ae692c6611 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package dns
import (
"context"
"errors"
"fmt"
"os"
"sync/atomic"
"testing"
"time"
"golang.org/x/sync/errgroup"
)
func TestWatchFile(t *testing.T) {
dir := t.TempDir()
filepath := dir + "/test.txt"
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var callbackCalled atomic.Bool
callbackDone := make(chan bool)
callback := func() {
callbackDone <- true
callbackCalled.Store(true)
}
var eg errgroup.Group
eg.Go(func() error { return watchFile(ctx, dir, filepath, callback) })
// Keep writing until we get a callback.
func() {
for i := range 10000 {
if err := os.WriteFile(filepath, []byte(fmt.Sprintf("write%d", i)), 0644); err != nil {
t.Fatal(err)
}
select {
case <-callbackDone:
return
case <-time.After(10 * time.Millisecond):
}
}
}()
cancel()
if err := eg.Wait(); err != nil && !errors.Is(err, context.Canceled) {
t.Error(err)
}
if !callbackCalled.Load() {
t.Error("callback was not called")
}
}
|
