fix: revert change to ChatAgent and test for example (#664)

Author: Wendong-Fan

camel/agents/chat_agent.py

@@ -522,19 +522,11 @@ def handle_batch_response(
         """
         output_messages: List[BaseMessage] = []
         for choice in response.choices:
-            if isinstance(choice.message, list):
-                # If choice.message is a list, handle accordingly
-                # It's a check to fit with Nemotron model integration.
-                content = "".join(
-                    [msg.content for msg in choice.message if msg.content]
-                )
-            else:
-                content = choice.message.content or ""
             chat_message = BaseMessage(
                 role_name=self.role_name,
                 role_type=self.role_type,
                 meta_dict=dict(),
-                content=content,
+                content=choice.message.content or "",
             )
             output_messages.append(chat_message)
         finish_reasons = [

examples/test/test_role_description_example.py

@@ -18,20 +18,26 @@
 from camel.models import ModelFactory
 from camel.types import ModelPlatformType, ModelType
 
-model = ModelFactory.create(
+model_gpt = ModelFactory.create(
     ModelPlatformType.OPENAI,
     model_type=ModelType.GPT_3_5_TURBO,
     model_config_dict={},
 )
 
+model_stub = ModelFactory.create(
+    ModelPlatformType.OPENAI,
+    model_type=ModelType.STUB,
+    model_config_dict={},
+)
+
 
 def test_role_generation_example():
     with patch('time.sleep', return_value=None):
-        examples.role_description.role_generation.main(model)
+        examples.role_description.role_generation.main(model_gpt)
 
 
 def test_role_playing_with_role_description_example():
     with patch('time.sleep', return_value=None):
         examples.role_description.role_playing_with_role_description.main(
-            model, model, chat_turn_limit=2
+            model_gpt, model_stub, chat_turn_limit=2
         )

examples/test/test_single_agent.py

@@ -39,7 +39,16 @@ def test_single_agent(model):
     examples.single_agent.main(model=model)
 
 
-@parametrize
+@pytest.mark.parametrize(
+    'model',
+    [
+        ModelFactory.create(
+            ModelPlatformType.OPENAI,
+            model_type=ModelType.STUB,
+            model_config_dict={},
+        )
+    ],
+)
 def test_misalignment_single_agent(model):
     examples.misalignment.single_agent.main(model=model)
 
@@ -54,6 +63,15 @@ def test_code_generate_metadata(model):
     examples.code.generate_meta_data.main(model=model)
 
 
-@parametrize
+@pytest.mark.parametrize(
+    'model',
+    [
+        ModelFactory.create(
+            ModelPlatformType.OPENAI,
+            model_type=ModelType.STUB,
+            model_config_dict={},
+        )
+    ],
+)
 def test_code_task_generation(model):
     examples.code.task_generation.main(model=model)