nns: add admin to properties

See https://github.com/neo-project/non-native-contracts/blob/14f43ba8cf169323b61c23a3a701ac77d9a4e3eb/src/NameService/NameService.cs#L69.

examples/nft-nd-nns/nns.go

@@ -118,6 +118,7 @@ func Properties(tokenID []byte) map[string]interface{} {
 	return map[string]interface{}{
 		"name":       ns.Name,
 		"expiration": ns.Expiration,
+		"admin":      ns.Admin,
 	}
 }
 

examples/nft-nd-nns/nns_test.go

@@ -187,6 +187,7 @@ func TestRegisterAndRenew(t *testing.T) {
 	props := stackitem.NewMap()
 	props.Add(stackitem.Make("name"), stackitem.Make("neo.com"))
 	props.Add(stackitem.Make("expiration"), stackitem.Make(expectedExpiration))
+	props.Add(stackitem.Make("admin"), stackitem.Null{}) // no admin was set
 	c.Invoke(t, props, "properties", "neo.com")
 	c.Invoke(t, 5, "balanceOf", e.CommitteeHash) // org, com, qqq...qqq.com, neo.com, test-domain.com
 	c.Invoke(t, e.CommitteeHash.BytesBE(), "ownerOf", []byte("neo.com"))
@@ -326,13 +327,19 @@ func TestSetAdmin(t *testing.T) {
 
 	cOwner.InvokeFail(t, "not witnessed by admin", "register", "neo.com", owner.ScriptHash()) // admin is committee
 	cOwnerCommittee.Invoke(t, true, "register", "neo.com", owner.ScriptHash())
+	expectedExpiration := e.TopBlock(t).Timestamp + millisecondsInYear
 	cGuest.InvokeFail(t, "not witnessed", "setAdmin", "neo.com", admin.ScriptHash())
 
 	// Must be witnessed by both owner and admin.
 	cOwner.InvokeFail(t, "not witnessed by admin", "setAdmin", "neo.com", admin.ScriptHash())
 	cAdmin.InvokeFail(t, "not witnessed by owner", "setAdmin", "neo.com", admin.ScriptHash())
 	cc := c.WithSigners(owner, admin)
 	cc.Invoke(t, stackitem.Null{}, "setAdmin", "neo.com", admin.ScriptHash())
+	props := stackitem.NewMap()
+	props.Add(stackitem.Make("name"), stackitem.Make("neo.com"))
+	props.Add(stackitem.Make("expiration"), stackitem.Make(expectedExpiration))
+	props.Add(stackitem.Make("admin"), stackitem.Make(admin.ScriptHash().BytesBE()))
+	c.Invoke(t, props, "properties", "neo.com")
 
 	t.Run("set and delete by admin", func(t *testing.T) {
 		cAdmin.Invoke(t, stackitem.Null{}, "setRecord", "neo.com", int64(nns.TXT), "sometext")