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[backport/v0.41.x]: snapshots: fix flaky tests #8484

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Feb 4, 2021
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[backport/v0.41.x]: snapshots: fix flaky tests #8484

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6 changes: 5 additions & 1 deletion snapshots/helpers_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import (
"errors"
"io"
"io/ioutil"
"os"
"testing"
"time"

Expand Down Expand Up @@ -100,7 +101,10 @@ func (m *mockSnapshotter) Snapshot(height uint64, format uint32) (<-chan io.Read
// setupBusyManager creates a manager with an empty store that is busy creating a snapshot at height 1.
// The snapshot will complete when the returned closer is called.
func setupBusyManager(t *testing.T) *snapshots.Manager {
tempdir := t.TempDir()
tempdir, err := ioutil.TempDir("", "")
require.NoError(t, err)
t.Cleanup(func() { _ = os.RemoveAll(tempdir) })
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why this works, and t.TempDir doesn't?

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Take a look at how testing.T.TempDir() is implemented. Plus, please read the original commit's comment. It's quite a common issue

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OK, thanks. Maybe we should add a comment to the code explaining shortly why we use ioutil.TempDir or link the golang issue?

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@alessio alessio Feb 3, 2021 •
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Yeah I thought about it. Then I thought that git blame & git log could provide enough documentation. But you're right, an inline comment would be definitely more helpful and convenient. I'll fix it in a PR to master

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@robert-zaremba robert-zaremba Feb 3, 2021 •
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yes - let's update. thanks. It takes way more energy to do git blame; git log than adding a comment. Also, it's much easier to read that comment then think about this workaround.

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#8508


store, err := snapshots.NewStore(db.NewMemDB(), tempdir)
require.NoError(t, err)
hung := newHungSnapshotter()
Expand Down
6 changes: 5 additions & 1 deletion snapshots/store_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import (
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
Expand All @@ -19,7 +20,10 @@ import (
)

func setupStore(t *testing.T) *snapshots.Store {
tempdir := t.TempDir()
tempdir, err := ioutil.TempDir("", "")
require.NoError(t, err)
t.Cleanup(func() { _ = os.RemoveAll(tempdir) })

store, err := snapshots.NewStore(db.NewMemDB(), tempdir)
require.NoError(t, err)

Expand Down