minor adjustments

Author: hiroshihorie

lib/src/token_source/caching.dart

@@ -164,7 +164,7 @@ extension CachedTokenSource on TokenSourceConfigurable {
   ///   - store: The store implementation to use for caching (defaults to in-memory store)
   ///   - validator: A function to determine if cached credentials are still valid (defaults to JWT expiration check)
   /// - Returns: A caching token source that wraps this token source
-  TokenSourceConfigurable cached({
+  CachingTokenSource cached({
     TokenStore? store,
     TokenValidator? validator,
   }) =>

lib/src/token_source/custom.dart

@@ -31,8 +31,5 @@ class CustomTokenSource implements TokenSourceConfigurable {
   CustomTokenSource(CustomTokenFunction function) : _function = function;
 
   @override
-  Future<TokenSourceResponse> fetch([TokenRequestOptions? options]) async {
-    final requestOptions = options ?? const TokenRequestOptions();
-    return await _function(requestOptions);
-  }
+  Future<TokenSourceResponse> fetch(TokenRequestOptions options) async => _function(options);
 }

lib/src/token_source/token_source.dart

@@ -61,7 +61,7 @@ class TokenRequestOptions {
       participantIdentity: participantIdentity,
       participantMetadata: participantMetadata,
       participantAttributes: participantAttributes,
-      roomConfiguration: agents != null ? RoomConfiguration(agents: agents) : null,
+      roomConfiguration: RoomConfiguration(agents: agents),
     );
   }
 

test/token/caching_token_source_test.dart

@@ -333,9 +333,7 @@ class _MockTokenSource implements TokenSourceConfigurable {
   _MockTokenSource(this._fetchFn);
 
   @override
-  Future<TokenSourceResponse> fetch([TokenRequestOptions? options]) {
-    return _fetchFn(options ?? const TokenRequestOptions());
-  }
+  Future<TokenSourceResponse> fetch(TokenRequestOptions options) => _fetchFn(options);
 }
 
 String _generateValidToken() {

test/token/endpoint_token_source_test.dart

@@ -112,7 +112,7 @@ void main() {
       expect(capturedRequest, isNotNull);
       expect(capturedRequest!.method, 'GET');
       // Body is always sent even for GET requests
-      expect(capturedRequest!.body, '{}');
+      expect(capturedRequest!.body, '{"room_config":{}}');
     });
 
     test('accepts non-200 success responses', () async {
@@ -298,7 +298,9 @@ void main() {
 
       final json = options.toRequest().toJson();
 
-      expect(json, isEmpty);
+      expect(json.keys, contains('room_config'));
+      expect(json['room_config'], isMap);
+      expect((json['room_config'] as Map), isEmpty);
     });
 
     test('only includes non-null fields', () {
@@ -313,6 +315,8 @@ void main() {
       expect(json.containsKey('room_name'), isTrue);
       expect(json.containsKey('participant_name'), isFalse);
       expect(json.containsKey('participant_identity'), isTrue);
+      expect(json.containsKey('room_config'), isTrue);
+      expect((json['room_config'] as Map), isEmpty);
     });
   });
 

test/token/token_source_test.dart

@@ -18,8 +18,8 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:livekit_client/src/token_source/custom.dart';
 import 'package:livekit_client/src/token_source/jwt.dart';
 import 'package:livekit_client/src/token_source/literal.dart';
-import 'package:livekit_client/src/token_source/sandbox.dart';
 import 'package:livekit_client/src/token_source/room_configuration.dart';
+import 'package:livekit_client/src/token_source/sandbox.dart';
 import 'package:livekit_client/src/token_source/token_source.dart';
 
 void main() {
@@ -354,7 +354,7 @@ void main() {
       expect(request.roomConfiguration!.agents![0].metadata, '{"key":"value"}');
     });
 
-    test('toRequest() creates null roomConfiguration when no agent fields', () {
+    test('toRequest() creates empty roomConfiguration when no agent fields', () {
       const options = TokenRequestOptions(
         roomName: 'test-room',
         participantName: 'test-participant',
@@ -364,7 +364,8 @@ void main() {
 
       expect(request.roomName, 'test-room');
       expect(request.participantName, 'test-participant');
-      expect(request.roomConfiguration, isNull);
+      expect(request.roomConfiguration, isNotNull);
+      expect(request.roomConfiguration!.agents, isNull);
     });
 
     test('TokenSourceRequest.toJson() produces correct wire format', () {