Test HfApiModel call with custom_role_conversions

tests/test_models.py

@@ -17,13 +17,13 @@
 import unittest
 from pathlib import Path
 from typing import Optional
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 from transformers.testing_utils import get_tests_dir
 
 from smolagents import ChatMessage, HfApiModel, TransformersModel, models, tool
-from smolagents.models import get_clean_message_list, parse_json_if_needed
+from smolagents.models import MessageRole, get_clean_message_list, parse_json_if_needed
 
 
 class ModelTests(unittest.TestCase):
@@ -103,6 +103,19 @@ def test_parse_json_if_needed(self):
         assert parsed_args == 3
 
 
+class TestHfApiModel:
+    def test_call_with_custom_role_conversions(self):
+        custom_role_conversions = {MessageRole.USER: MessageRole.SYSTEM}
+        model = HfApiModel(model_id="test-model", custom_role_conversions=custom_role_conversions)
+        model.client = MagicMock()
+        messages = [{"role": "user", "content": "Test message"}]
+        _ = model(messages)
+        # Verify that the role conversion was applied
+        assert model.client.chat_completion.call_args.kwargs["messages"][0]["role"] == "system", (
+            "role conversion should be applied"
+        )
+
+
 def test_get_clean_message_list_basic():
     messages = [
         {"role": "user", "content": [{"type": "text", "text": "Hello!"}]},