test: add metadata NIP-65 relay discovery regression

Author: nogringo

packages/ndk/test/usecases/metadatas/metadata_nip65_test.dart

@@ -0,0 +1,61 @@
+import 'package:test/test.dart';
+import 'package:ndk/domain_layer/entities/nip_65.dart';
+import 'package:ndk/domain_layer/entities/read_write_marker.dart';
+import 'package:ndk/ndk.dart';
+import 'package:ndk/shared/nips/nip01/bip340.dart';
+
+import '../../mocks/mock_relay.dart';
+
+void main() {
+  test('loadMetadata follows the author write relay', () async {
+    final key = Bip340.generatePrivateKey();
+    final metadata = Metadata(pubKey: key.publicKey, name: 'nip65-profile');
+
+    final profileRelay = MockRelay(name: 'profile relay');
+    final signedMetadataEvent = Nip01Utils.signWithPrivateKey(
+      event: metadata.toEvent(),
+      privateKey: key.privateKey!,
+    );
+    await profileRelay.startServer(metadatas: {
+      key.publicKey: signedMetadataEvent,
+    });
+
+    final relayList = Nip65.fromMap(key.publicKey, {
+      profileRelay.url: ReadWriteMarker.readWrite,
+    });
+    final signedRelayListEvent = Nip01Utils.signWithPrivateKey(
+      event: relayList.toEvent(),
+      privateKey: key.privateKey!,
+    );
+    final relayListBootstrap = MockRelay(name: 'relay list bootstrap');
+    await relayListBootstrap.startServer();
+
+    final ndk = Ndk(NdkConfig(
+      eventVerifier: Bip340EventVerifier(),
+      cache: MemCacheManager(),
+      bootstrapRelays: [relayListBootstrap.url],
+    ));
+
+    await ndk.relays.seedRelaysConnected;
+
+    addTearDown(() async {
+      await ndk.destroy();
+      await relayListBootstrap.stopServer();
+      await profileRelay.stopServer();
+    });
+
+    await ndk.broadcast
+        .broadcast(
+          nostrEvent: signedRelayListEvent,
+          specificRelays: [relayListBootstrap.url],
+          saveToCache: false,
+        )
+        .broadcastDoneFuture;
+
+    final loaded = await ndk.metadata.loadMetadata(
+      key.publicKey,
+    );
+
+    expect(loaded?.name, equals(metadata.name));
+  });
+}