diff --git a/identity/identity_test.go b/identity/identity_test.go
index a93ef86..237fddd 100644
--- a/identity/identity_test.go
+++ b/identity/identity_test.go
@@ -1,11 +1,19 @@
 package identity
 
 import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"fmt"
 	"testing"
 )
 
 func TestIdentity(t *testing.T) {
-	id := Init("../testing/private_key")
+	id := Identity{}
+	if id.Initialized() != false {
+		t.Errorf("Identity should not be initialized")
+	}
+
+	id = Init("../testing/private_key")
 	if id.Initialized() == false {
 		t.Errorf("Identity should be initialized")
 	}
@@ -13,4 +21,14 @@ func TestIdentity(t *testing.T) {
 	if id.Hostname() != "kwke2hntvyfqm7dr" {
 		t.Errorf("Expected %v as Hostname() got: %v", "kwke2hntvyfqm7dr", id.Hostname())
 	}
+
+	mac := hmac.New(sha256.New, []byte("Hello"))
+	mac.Write([]byte("World"))
+	hmac := mac.Sum(nil)
+	bytes, err := id.Sign(hmac)
+	expected := "b0a0a0562735b559e0efb5b3431f1aa31ddc90d2cff114d0dc05980351a4ddc6086d92efdded8a7c447a2bab4afc5f031755738d1b21edba72680dea0e33b62e914faa1f596d5f76ca0ee91cb06e4ebab748a222cc860437b7c7afd12ebee6d6998b52183bd9eb9d5b96ea95900245480539464fa889719925e569cac0cecbc1"
+	actual := fmt.Sprintf("%x", bytes)
+	if expected != actual || err != nil {
+		t.Errorf("Identity sign failed, %v %v", actual, err)
+	}
 }