test: use T.TempDir to create temporary test directory

The directory created by `T.TempDir` is automatically removed when the
test and all its subtests complete.

Reference: https://pkg.go.dev/testing#T.TempDir
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/cri/server/helpers_linux_test.go

@@ -65,15 +65,9 @@ func TestEnsureRemoveAllWithMount(t *testing.T) {
 		t.Skip("skipping test that requires root")
 	}
 
-	dir1, err := os.MkdirTemp("", "test-ensure-removeall-with-dir1")
-	if err != nil {
-		t.Fatal(err)
-	}
-	dir2, err := os.MkdirTemp("", "test-ensure-removeall-with-dir2")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir2)
+	var err error
+	dir1 := t.TempDir()
+	dir2 := t.TempDir()
 
 	bindDir := filepath.Join(dir1, "bind")
 	if err := os.MkdirAll(bindDir, 0755); err != nil {

pkg/cri/server/helpers_test.go

@@ -492,10 +492,7 @@ func TestEnsureRemoveAllNotExist(t *testing.T) {
 }
 
 func TestEnsureRemoveAllWithDir(t *testing.T) {
-	dir, err := os.MkdirTemp("", "test-ensure-removeall-with-dir")
-	if err != nil {
-		t.Fatal(err)
-	}
+	dir := t.TempDir()
 	if err := ensureRemoveAll(context.Background(), dir); err != nil {
 		t.Fatal(err)
 	}

pkg/cri/server/update_runtime_config_test.go

@@ -93,11 +93,9 @@ func TestUpdateRuntimeConfig(t *testing.T) {
 		},
 	} {
 		t.Run(name, func(t *testing.T) {
-			testDir, err := os.MkdirTemp(os.TempDir(), "test-runtime-config")
-			require.NoError(t, err)
-			defer os.RemoveAll(testDir)
+			testDir := t.TempDir()
 			templateName := filepath.Join(testDir, "template")
-			err = os.WriteFile(templateName, []byte(testTemplate), 0666)
+			err := os.WriteFile(templateName, []byte(testTemplate), 0666)
 			require.NoError(t, err)
 			confDir := filepath.Join(testDir, "net.d")
 			confName := filepath.Join(confDir, cniConfigFileName)

pkg/cri/store/container/status_test.go

@@ -114,9 +114,7 @@ func TestStatus(t *testing.T) {
 	assert := assertlib.New(t)
 	require := requirelib.New(t)
 
-	tempDir, err := os.MkdirTemp(os.TempDir(), "status-test")
-	require.NoError(err)
-	defer os.RemoveAll(tempDir)
+	tempDir := t.TempDir()
 	statusFile := filepath.Join(tempDir, "status")
 
 	t.Logf("simple store and get")