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[vipersync] deflake TestWatchConfig #13545

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merged 2 commits into from
Jul 18, 2023
Merged

[vipersync] deflake TestWatchConfig #13545

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bd43f89
slight rewrite to take more params
Jul 18, 2023
a9ee42d
watchconfig runs in its own tempdir
Jul 18, 2023
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28 changes: 14 additions & 14 deletions go/viperutil/internal/sync/sync_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,19 +36,16 @@ import (
)

func TestWatchConfig(t *testing.T) {
t.Skip("flaky test (@ajm188): https://github.com/vitessio/vitess/issues/13498")
type config struct {
A, B int
}

tmp, err := os.CreateTemp(".", "TestWatchConfig_*.json")
require.NoError(t, err)
t.Cleanup(func() { os.Remove(tmp.Name()) })

stat, err := os.Stat(tmp.Name())
require.NoError(t, err)
writeConfig := func(tmp *os.File, a, b int) error {
stat, err := os.Stat(tmp.Name())
if err != nil {
return err
}

writeConfig := func(a, b int) error {
data, err := json.Marshal(&config{A: a, B: b})
if err != nil {
return err
Expand All @@ -75,19 +72,22 @@ func TestWatchConfig(t *testing.T) {

return nil
}
writeRandomConfig := func() error {
writeRandomConfig := func(tmp *os.File) error {
a, b := rand.Intn(100), rand.Intn(100)
return writeConfig(a, b)
return writeConfig(tmp, a, b)
}

require.NoError(t, writeRandomConfig())
tmp, err := os.CreateTemp(t.TempDir(), "TestWatchConfig_*.json")
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@mattlord mattlord Jul 18, 2023 •
edited
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Noting that this is the key fix, as we're using a dedicated directory for our config files rather than the (very deep) PWD for the tests of the vitess root dir (VTROOT).

require.NoError(t, err)

require.NoError(t, writeRandomConfig(tmp))

v := viper.New()
v.SetConfigFile(tmp.Name())
require.NoError(t, v.ReadInConfig())

wCh, rCh := make(chan struct{}), make(chan struct{})
v.OnConfigChange(func(in fsnotify.Event) {
v.OnConfigChange(func(event fsnotify.Event) {
select {
case <-rCh:
return
Expand All @@ -103,7 +103,7 @@ func TestWatchConfig(t *testing.T) {
// Make sure that basic, unsynchronized WatchConfig is set up before
// beginning the actual test.
a, b := v.GetInt("a"), v.GetInt("b")
require.NoError(t, writeConfig(a+1, b+1))
require.NoError(t, writeConfig(tmp, a+1, b+1))
<-wCh // wait for the update to finish

require.Equal(t, a+1, v.GetInt("a"))
Expand Down Expand Up @@ -163,7 +163,7 @@ func TestWatchConfig(t *testing.T) {
}

for i := 0; i < 100; i++ {
require.NoError(t, writeRandomConfig())
require.NoError(t, writeRandomConfig(tmp))
time.Sleep(writeJitter())
}

Expand Down
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