diff --git a/common/serial/string_test.go b/common/serial/string_test.go
new file mode 100644
index 000000000..b8beb3cd9
--- /dev/null
+++ b/common/serial/string_test.go
@@ -0,0 +1,24 @@
+package serial_test
+
+import (
+	"testing"
+
+	. "github.com/v2ray/v2ray-core/common/serial"
+	v2testing "github.com/v2ray/v2ray-core/testing"
+	"github.com/v2ray/v2ray-core/testing/assert"
+)
+
+type TestString struct {
+	value string
+}
+
+func (this *TestString) String() string {
+	return this.value
+}
+
+func TestNewStringSerial(t *testing.T) {
+	v2testing.Current(t)
+
+	testString := &TestString{value: "abcd"}
+	assert.String(NewStringLiteral(testString)).Equals("abcd")
+}