diff --git a/pkg/testing/fs.go b/pkg/testing/fs.go
index 7603f836..91637b10 100644
--- a/pkg/testing/fs.go
+++ b/pkg/testing/fs.go
@@ -1 +1,72 @@
 package testing
+
+import (
+	"os"
+	"path"
+	"log"
+	"math/rand"
+	"time"
+)
+
+// Initialize random seed for randStr()
+func init() {
+	rand.New(rand.NewSource(time.Now().UnixNano()))
+}
+
+// createTmpDir returns a path to a newly created temporary directory.
+func createTmpDir() string {
+	prefix := "sxwl-test-"
+	dir := path.Join(os.TempDir(), prefix+randStr(10))
+	err := os.MkdirAll(dir, os.ModePerm)
+	if err != nil {
+		log.Fatalf("Failed to create tmp dir '%s', error: %v", dir, err)
+	}
+	return dir
+}
+
+func randStr(n int) string {
+	var letters = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}
+
+// getTmpFilePath returns a random file path under temp directory.
+// The file is not created.
+func getTmpFilePath() string {
+	return path.Join(createTmpDir(), randStr(10))
+}
+
+// CreateTmpFile returns a path to a file under the temporary directory.
+func CreateTmpFile() string {
+	f := getTmpFilePath()
+	openedFile, err := os.Create(f)
+	if err != nil {
+		log.Fatalf("While creating temp file at '%s', failed to create the file, error: %v", f, err)
+	}
+	err = openedFile.Close()
+	if err != nil {
+		log.Fatalf("While creating temp file at '%s', failed to close the file after creation, error: %v", f, err)
+	}
+	return f
+}
+
+func CreateTmpFileWithContent(content string) string {
+	f := getTmpFilePath()
+	const defaultPerf = 0o644
+	err := os.WriteFile(f, []byte(content), defaultPerf)
+	if err != nil {
+		log.Fatalf("Failed to write to file '%s', error: %v", f, err)
+	}
+	return f
+}
+
+func MustReadFile(f string) string {
+	content, err := os.ReadFile(f)
+	if err != nil {
+		log.Fatalf("Failed to read file '%s', error: %v", f, err)
+	}
+	return string(content)
+}
diff --git a/pkg/testing/fs_test.go b/pkg/testing/fs_test.go
index 7603f836..65f5f4e1 100644
--- a/pkg/testing/fs_test.go
+++ b/pkg/testing/fs_test.go
@@ -1 +1,19 @@
 package testing
+
+import (
+	"testing"
+
+	"sxwl/3k/pkg/utils/fs"
+)
+
+func TestCreateTmpFile(t *testing.T) {
+	p := CreateTmpFile()
+	if !fs.Exists(p) {
+		t.Errorf("%s should be created, but does not exist", p)
+	}
+
+	p = CreateTmpFileWithContent("content")
+	if MustReadFile(p) != "content" {
+		t.Errorf("p is not empty, %s", p)
+	}
+}
diff --git a/pkg/utils/fs/fs.go b/pkg/utils/fs/fs.go
new file mode 100644
index 00000000..a128e9ab
--- /dev/null
+++ b/pkg/utils/fs/fs.go
@@ -0,0 +1,8 @@
+package fs
+
+import "os"
+
+func Exists(path string) bool {
+	_, err := os.Stat(path)
+	return !os.IsNotExist(err)
+}