diff --git a/packages/ndk/test/mocks/mock_relay.dart b/packages/ndk/test/mocks/mock_relay.dart
index f91f3b96b..e20108712 100644
--- a/packages/ndk/test/mocks/mock_relay.dart
+++ b/packages/ndk/test/mocks/mock_relay.dart
@@ -32,6 +32,7 @@ class MockRelay {
   bool allwaysSendBadJson;
   bool sendMalformedEvents;
   String? customWelcomeMessage;
+  String? bannedWord;
 
   // NIP-46 Remote Signer Support
   static const int kNip46Kind = BunkerRequest.kKind;
@@ -56,6 +57,7 @@ class MockRelay {
     this.allwaysSendBadJson = false,
     this.sendMalformedEvents = false,
     this.customWelcomeMessage,
+    this.bannedWord,
     int? explicitPort,
   }) : _nip65s = nip65s {
     if (explicitPort != null) {
@@ -145,6 +147,16 @@ class MockRelay {
         if (eventJson[0] == "EVENT") {
           Nip01Event newEvent = Nip01EventModel.fromJson(eventJson[1]);
           if (verify(newEvent.pubKey, newEvent.id, newEvent.sig!)) {
+            // Check if event contains banned word
+            if (bannedWord != null && newEvent.content.contains(bannedWord!)) {
+              webSocket.add(jsonEncode([
+                "OK",
+                newEvent.id,
+                false,
+                "blocked: content contains banned word"
+              ]));
+              return;
+            }
             // Check auth for events if required (any authenticated user is OK)
             if (requireAuthForEvents && authenticatedPubkeys.isEmpty) {
               webSocket.add(jsonEncode([
diff --git a/packages/ndk/test/usecases/broadcast_sources_test.dart b/packages/ndk/test/usecases/broadcast_sources_test.dart
new file mode 100644
index 000000000..b788b6c4b
--- /dev/null
+++ b/packages/ndk/test/usecases/broadcast_sources_test.dart
@@ -0,0 +1,44 @@
+import 'package:ndk/ndk.dart';
+import 'package:ndk/shared/nips/nip01/bip340.dart';
+import 'package:test/test.dart';
+
+import '../mocks/mock_event_verifier.dart';
+import '../mocks/mock_relay.dart';
+
+void main() async {
+  test("braodcast should update source", () async {
+    final relay = MockRelay(name: "relay");
+
+    await relay.startServer();
+
+    final ndk = Ndk(NdkConfig(
+      eventVerifier: MockEventVerifier(),
+      cache: MemCacheManager(),
+      bootstrapRelays: [relay.url],
+    ));
+
+    final keypair = Bip340.generatePrivateKey();
+    final signer = Bip340EventSigner(
+      privateKey: keypair.privateKey,
+      publicKey: keypair.publicKey,
+    );
+    ndk.accounts.loginExternalSigner(signer: signer);
+
+    final event = Nip01Event(
+      pubKey: keypair.publicKey,
+      kind: 1,
+      tags: [],
+      content: "content",
+    );
+
+    await ndk.broadcast.broadcast(nostrEvent: event).broadcastDoneFuture;
+
+    final localEvent = await ndk.config.cache.loadEvent(event.id);
+
+    expect(localEvent, isNotNull);
+    expect(localEvent!.sources, isNotEmpty);
+
+    await ndk.destroy();
+    await relay.stopServer();
+  });
+}
diff --git a/packages/ndk/test/usecases/stream_response_cleaner/event_sources_merge_test.dart b/packages/ndk/test/usecases/stream_response_cleaner/event_sources_merge_test.dart
new file mode 100644
index 000000000..3a429357f
--- /dev/null
+++ b/packages/ndk/test/usecases/stream_response_cleaner/event_sources_merge_test.dart
@@ -0,0 +1,53 @@
+import 'package:ndk/shared/nips/nip01/bip340.dart';
+import 'package:test/test.dart';
+import 'package:ndk/ndk.dart';
+
+import '../../mocks/mock_event_verifier.dart';
+import '../../mocks/mock_relay.dart';
+
+void main() async {
+  test("requests should update sources", () async {
+    final bannedWord = "cow";
+
+    final relay1 = MockRelay(name: "relay 1");
+    final relay2 = MockRelay(name: "relay 2");
+    final relay3 = MockRelay(name: "relay 2", bannedWord: bannedWord);
+
+    await relay1.startServer();
+    await relay2.startServer();
+    await relay3.startServer();
+
+    final ndk = Ndk(NdkConfig(
+      eventVerifier: MockEventVerifier(),
+      cache: MemCacheManager(),
+      bootstrapRelays: [relay1.url, relay2.url, relay3.url],
+    ));
+
+    final keypair = Bip340.generatePrivateKey();
+    final signer = Bip340EventSigner(
+      privateKey: keypair.privateKey,
+      publicKey: keypair.publicKey,
+    );
+    ndk.accounts.loginExternalSigner(signer: signer);
+
+    final event = Nip01Event(
+      pubKey: keypair.publicKey,
+      kind: 1,
+      tags: [],
+      content: bannedWord,
+    );
+    await ndk.broadcast.broadcast(nostrEvent: event).broadcastDoneFuture;
+
+    await ndk.config.cache.clearAll();
+
+    final query = ndk.requests.query(filter: Filter(ids: [event.id]));
+    final events = await query.future;
+
+    expect(events.first.sources.length, equals(2));
+
+    await ndk.destroy();
+    await relay1.stopServer();
+    await relay2.stopServer();
+    await relay3.stopServer();
+  });
+}