add test validating that createIdentity follows algorithm preference

init_test.go

@@ -0,0 +1,30 @@
+package config
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/ipfs/interface-go-ipfs-core/options"
+	crypto_pb "github.com/libp2p/go-libp2p-core/crypto/pb"
+)
+
+func TestCreateIdentity(t *testing.T) {
+	writer := bytes.NewBuffer(nil)
+	id, err := CreateIdentity(writer, []options.KeyGenerateOption{options.Key.Type(options.Ed25519Key)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	pk, err := id.DecodePrivateKey("")
+	if pk.Type() != crypto_pb.KeyType_Ed25519 {
+		t.Fatal("unexpected type:", pk.Type())
+	}
+
+	id, err = CreateIdentity(writer, []options.KeyGenerateOption{options.Key.Type(options.RSAKey)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	pk, err = id.DecodePrivateKey("")
+	if pk.Type() != crypto_pb.KeyType_RSA {
+		t.Fatal("unexpected type:", pk.Type())
+	}
+}