diff --git a/pkg/util/md5/helper_test.go b/pkg/util/md5/helper_test.go
new file mode 100644
index 000000000..de9227617
--- /dev/null
+++ b/pkg/util/md5/helper_test.go
@@ -0,0 +1,42 @@
+package md5
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestCalcFileMD5(t *testing.T) {
+	testDir := t.TempDir()
+	bFile, _ := os.Create(filepath.Join(testDir, "b.txt"))
+	cFile, _ := os.Create(filepath.Join(testDir, "c.txt"))
+	_, err := cFile.WriteString("test")
+	if err != nil {
+		t.Error(err)
+	}
+	defer bFile.Close()
+	defer cFile.Close()
+	tests := []struct {
+		name     string
+		filename string
+		want     string
+		wantErr  bool
+	}{
+		// TODO: Add test cases.
+		{"base not exist", "a.txt", "", true},
+		{"base empty file", bFile.Name(), "d41d8cd98f00b204e9800998ecf8427e", false},
+		{"base contented file", cFile.Name(), "098f6bcd4621d373cade4e832627b4f6", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := CalcFileMD5(tt.filename)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("CalcFileMD5() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("CalcFileMD5() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/pkg/util/md5/md5_test.go b/pkg/util/md5/md5_test.go
index afd05de13..c7c9919aa 100644
--- a/pkg/util/md5/md5_test.go
+++ b/pkg/util/md5/md5_test.go
@@ -60,6 +60,8 @@ func createFileAndMD5File(fileName string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	defer md5File.Close()
+
 	_, err = md5File.Write([]byte(md5))
 	if err != nil {
 		return "", err