test: use `T.TempDir` to create temporary test directory (#21043)

A testing cleanup. 

This pull request replaces `os.MkdirTemp` with `t.TempDir`. We can use the `T.TempDir` function from the `testing` package to create temporary directory. The directory created by `T.TempDir` is automatically removed when the test and all its subtests complete. 

This saves us at least 2 lines (error check, and cleanup) on every instance, or in some cases adds cleanup that we forgot.

Reference: https://pkg.go.dev/testing#T.TempDir

```go
func TestFoo(t *testing.T) {
	// before
	tmpDir, err := os.MkdirTemp("", "")
	require.NoError(t, err)
	defer os.RemoveAll(tmpDir)

	// now
	tmpDir := t.TempDir()
}
```

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

9 files changed, 20 insertions, 82 deletions

diff --git a/modules/git/commit_info_test.go b/modules/git/commit_info_test.go
index a12452c404..4bc3596896 100644
--- a/modules/git/commit_info_test.go
+++ b/modules/git/commit_info_test.go
@@ -6,13 +6,10 @@ package git
 
 import (
 	"context"
-	"os"
 	"path/filepath"
 	"testing"
 	"time"
 
-	"code.gitea.io/gitea/modules/util"
-
 	"github.com/stretchr/testify/assert"
 )
 
@@ -20,18 +17,14 @@ const (
 	testReposDir = "tests/repos/"
 )
 
-func cloneRepo(url, name string) (string, error) {
-	repoDir, err := os.MkdirTemp("", name)
-	if err != nil {
-		return "", err
-	}
+func cloneRepo(tb testing.TB, url string) (string, error) {
+	repoDir := tb.TempDir()
 	if err := Clone(DefaultContext, url, repoDir, CloneRepoOptions{
 		Mirror:  false,
 		Bare:    false,
 		Quiet:   true,
 		Timeout: 5 * time.Minute,
 	}); err != nil {
-		_ = util.RemoveAll(repoDir)
 		return "", err
 	}
 	return repoDir, nil
@@ -118,11 +111,10 @@ func TestEntries_GetCommitsInfo(t *testing.T) {
 
 	testGetCommitsInfo(t, bareRepo1)
 
-	clonedPath, err := cloneRepo(bareRepo1Path, "repo1_TestEntries_GetCommitsInfo")
+	clonedPath, err := cloneRepo(t, bareRepo1Path)
 	if err != nil {
 		assert.NoError(t, err)
 	}
-	defer util.RemoveAll(clonedPath)
 	clonedRepo1, err := openRepositoryWithDefaultContext(clonedPath)
 	if err != nil {
 		assert.NoError(t, err)
@@ -150,11 +142,10 @@ func BenchmarkEntries_GetCommitsInfo(b *testing.B) {
 		var commit *Commit
 		var entries Entries
 		var repo *Repository
-		repoPath, err := cloneRepo(benchmark.url, benchmark.name)
+		repoPath, err := cloneRepo(b, benchmark.url)
 		if err != nil {
 			b.Fatal(err)
 		}
-		defer util.RemoveAll(repoPath)
 
 		if repo, err = openRepositoryWithDefaultContext(repoPath); err != nil {
 			b.Fatal(err)
diff --git a/modules/git/repo_compare_test.go b/modules/git/repo_compare_test.go
index 245920c2bd..63f7254dea 100644
--- a/modules/git/repo_compare_test.go
+++ b/modules/git/repo_compare_test.go
@@ -10,19 +10,16 @@ import (
 	"path/filepath"
 	"testing"
 
-	"code.gitea.io/gitea/modules/util"
-
 	"github.com/stretchr/testify/assert"
 )
 
 func TestGetFormatPatch(t *testing.T) {
 	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
-	clonedPath, err := cloneRepo(bareRepo1Path, "repo1_TestGetFormatPatch")
+	clonedPath, err := cloneRepo(t, bareRepo1Path)
 	if err != nil {
 		assert.NoError(t, err)
 		return
 	}
-	defer util.RemoveAll(clonedPath)
 
 	repo, err := openRepositoryWithDefaultContext(clonedPath)
 	if err != nil {
@@ -84,12 +81,11 @@ func TestReadWritePullHead(t *testing.T) {
 	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
 
 	// As we are writing we should clone the repository first
-	clonedPath, err := cloneRepo(bareRepo1Path, "TestReadWritePullHead")
+	clonedPath, err := cloneRepo(t, bareRepo1Path)
 	if err != nil {
 		assert.NoError(t, err)
 		return
 	}
-	defer util.RemoveAll(clonedPath)
 
 	repo, err := openRepositoryWithDefaultContext(clonedPath)
 	if err != nil {
diff --git a/modules/git/repo_tag_test.go b/modules/git/repo_tag_test.go
index 9d84672862..6a00473bb7 100644
--- a/modules/git/repo_tag_test.go
+++ b/modules/git/repo_tag_test.go
@@ -8,8 +8,6 @@ import (
 	"path/filepath"
 	"testing"
 
-	"code.gitea.io/gitea/modules/util"
-
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -38,12 +36,11 @@ func TestRepository_GetTags(t *testing.T) {
 func TestRepository_GetTag(t *testing.T) {
 	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
 
-	clonedPath, err := cloneRepo(bareRepo1Path, "TestRepository_GetTag")
+	clonedPath, err := cloneRepo(t, bareRepo1Path)
 	if err != nil {
 		assert.NoError(t, err)
 		return
 	}
-	defer util.RemoveAll(clonedPath)
 
 	bareRepo1, err := openRepositoryWithDefaultContext(clonedPath)
 	if err != nil {
@@ -143,12 +140,11 @@ func TestRepository_GetTag(t *testing.T) {
 func TestRepository_GetAnnotatedTag(t *testing.T) {
 	bareRepo1Path := filepath.Join(testReposDir, "repo1_bare")
 
-	clonedPath, err := cloneRepo(bareRepo1Path, "TestRepository_GetAnnotatedTag")
+	clonedPath, err := cloneRepo(t, bareRepo1Path)
 	if err != nil {
 		assert.NoError(t, err)
 		return
 	}
-	defer util.RemoveAll(clonedPath)
 
 	bareRepo1, err := openRepositoryWithDefaultContext(clonedPath)
 	if err != nil {
diff --git a/modules/indexer/code/bleve_test.go b/modules/indexer/code/bleve_test.go
index 37ed2eb9f0..a34d54bc0e 100644
--- a/modules/indexer/code/bleve_test.go
+++ b/modules/indexer/code/bleve_test.go
@@ -5,11 +5,9 @@
 package code
 
 import (
-	"os"
 	"testing"
 
 	"code.gitea.io/gitea/models/unittest"
-	"code.gitea.io/gitea/modules/util"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -17,13 +15,7 @@ import (
 func TestBleveIndexAndSearch(t *testing.T) {
 	unittest.PrepareTestEnv(t)
 
-	dir, err := os.MkdirTemp("", "bleve.index")
-	assert.NoError(t, err)
-	if err != nil {
-		assert.Fail(t, "Unable to create temporary directory")
-		return
-	}
-	defer util.RemoveAll(dir)
+	dir := t.TempDir()
 
 	idx, _, err := NewBleveIndexer(dir)
 	if err != nil {
diff --git a/modules/indexer/issues/bleve_test.go b/modules/indexer/issues/bleve_test.go
index 68a7831a3f..42d22f06a2 100644
--- a/modules/indexer/issues/bleve_test.go
+++ b/modules/indexer/issues/bleve_test.go
@@ -6,22 +6,13 @@ package issues
 
 import (
 	"context"
-	"os"
 	"testing"
 
-	"code.gitea.io/gitea/modules/util"
-
 	"github.com/stretchr/testify/assert"
 )
 
 func TestBleveIndexAndSearch(t *testing.T) {
-	dir, err := os.MkdirTemp("", "bleve.index")
-	assert.NoError(t, err)
-	if err != nil {
-		assert.Fail(t, "Unable to create temporary directory")
-		return
-	}
-	defer util.RemoveAll(dir)
+	dir := t.TempDir()
 	indexer := NewBleveIndexer(dir)
 	defer indexer.Close()
 
@@ -30,7 +21,7 @@ func TestBleveIndexAndSearch(t *testing.T) {
 		return
 	}
 
-	err = indexer.Index([]*IndexerData{
+	err := indexer.Index([]*IndexerData{
 		{
 			ID:      1,
 			RepoID:  2,
diff --git a/modules/indexer/issues/indexer_test.go b/modules/indexer/issues/indexer_test.go
index 6bafcbdf24..e8b9ff8370 100644
--- a/modules/indexer/issues/indexer_test.go
+++ b/modules/indexer/issues/indexer_test.go
@@ -6,7 +6,6 @@ package issues
 
 import (
 	"context"
-	"os"
 	"path"
 	"path/filepath"
 	"testing"
@@ -14,7 +13,6 @@ import (
 
 	"code.gitea.io/gitea/models/unittest"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/util"
 
 	_ "code.gitea.io/gitea/models"
 
@@ -32,11 +30,7 @@ func TestBleveSearchIssues(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	setting.Cfg = ini.Empty()
 
-	tmpIndexerDir, err := os.MkdirTemp("", "issues-indexer")
-	if err != nil {
-		assert.Fail(t, "Unable to create temporary directory: %v", err)
-		return
-	}
+	tmpIndexerDir := t.TempDir()
 
 	setting.Cfg.Section("queue.issue_indexer").Key("DATADIR").MustString(path.Join(tmpIndexerDir, "issues.queue"))
 
@@ -44,7 +38,6 @@ func TestBleveSearchIssues(t *testing.T) {
 	setting.Indexer.IssuePath = path.Join(tmpIndexerDir, "issues.queue")
 	defer func() {
 		setting.Indexer.IssuePath = oldIssuePath
-		util.RemoveAll(tmpIndexerDir)
 	}()
 
 	setting.Indexer.IssueType = "bleve"
diff --git a/modules/log/file_test.go b/modules/log/file_test.go
index c3074b69df..cc2b9fe077 100644
--- a/modules/log/file_test.go
+++ b/modules/log/file_test.go
@@ -14,15 +14,11 @@ import (
 	"testing"
 	"time"
 
-	"code.gitea.io/gitea/modules/util"
-
 	"github.com/stretchr/testify/assert"
 )
 
 func TestFileLoggerFails(t *testing.T) {
-	tmpDir, err := os.MkdirTemp("", "TestFileLogger")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	prefix := "TestPrefix "
 	level := INFO
@@ -34,7 +30,7 @@ func TestFileLoggerFails(t *testing.T) {
 	// assert.True(t, ok)
 
 	// Fail if there is bad json
-	err = fileLogger.Init("{")
+	err := fileLogger.Init("{")
 	assert.Error(t, err)
 
 	// Fail if there is no filename
@@ -47,9 +43,7 @@ func TestFileLoggerFails(t *testing.T) {
 }
 
 func TestFileLogger(t *testing.T) {
-	tmpDir, err := os.MkdirTemp("", "TestFileLogger")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	prefix := "TestPrefix "
 	level := INFO
@@ -150,9 +144,7 @@ func TestFileLogger(t *testing.T) {
 }
 
 func TestCompressFileLogger(t *testing.T) {
-	tmpDir, err := os.MkdirTemp("", "TestFileLogger")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	prefix := "TestPrefix "
 	level := INFO
@@ -210,9 +202,7 @@ func TestCompressFileLogger(t *testing.T) {
 }
 
 func TestCompressOldFile(t *testing.T) {
-	tmpDir, err := os.MkdirTemp("", "TestFileLogger")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 	fname := filepath.Join(tmpDir, "test")
 	nonGzip := filepath.Join(tmpDir, "test-nonGzip")
 
diff --git a/modules/queue/queue_disk_channel_test.go b/modules/queue/queue_disk_channel_test.go
index 22b4f0f452..b1820e73ac 100644
--- a/modules/queue/queue_disk_channel_test.go
+++ b/modules/queue/queue_disk_channel_test.go
@@ -5,13 +5,11 @@
 package queue
 
 import (
-	"os"
 	"sync"
 	"testing"
 	"time"
 
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/util"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -33,9 +31,7 @@ func TestPersistableChannelQueue(t *testing.T) {
 	queueShutdown := []func(){}
 	queueTerminate := []func(){}
 
-	tmpDir, err := os.MkdirTemp("", "persistable-channel-queue-test-data")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	queue, err := NewPersistableChannelQueue(handle, PersistableChannelQueueConfiguration{
 		DataDir:      tmpDir,
@@ -223,9 +219,7 @@ func TestPersistableChannelQueue_Pause(t *testing.T) {
 	queueTerminate := []func(){}
 	terminated := make(chan struct{})
 
-	tmpDir, err := os.MkdirTemp("", "persistable-channel-queue-pause-test-data")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	queue, err = NewPersistableChannelQueue(handle, PersistableChannelQueueConfiguration{
 		DataDir:      tmpDir,
diff --git a/modules/queue/queue_disk_test.go b/modules/queue/queue_disk_test.go
index d2d8e135cb..b0835c896f 100644
--- a/modules/queue/queue_disk_test.go
+++ b/modules/queue/queue_disk_test.go
@@ -5,13 +5,10 @@
 package queue
 
 import (
-	"os"
 	"sync"
 	"testing"
 	"time"
 
-	"code.gitea.io/gitea/modules/util"
-
 	"github.com/stretchr/testify/assert"
 )
 
@@ -30,9 +27,7 @@ func TestLevelQueue(t *testing.T) {
 	queueShutdown := []func(){}
 	queueTerminate := []func(){}
 
-	tmpDir, err := os.MkdirTemp("", "level-queue-test-data")
-	assert.NoError(t, err)
-	defer util.RemoveAll(tmpDir)
+	tmpDir := t.TempDir()
 
 	queue, err := NewLevelQueue(handle, LevelQueueConfiguration{
 		ByteFIFOQueueConfiguration: ByteFIFOQueueConfiguration{