fix: mark gemini async test with pytest.mark.asyncio

Author: iuriikogan

tests/clients/test_gemini.py

@@ -1,7 +1,7 @@
 """Tests for the Gemini client."""
 
 import os
-from unittest.mock import MagicMock, patch, AsyncMock
+from unittest.mock import MagicMock, patch
 
 import pytest
 from dotenv import load_dotenv
@@ -163,8 +163,9 @@ def test_message_list_completion(self):
         not os.environ.get("GEMINI_API_KEY"),
         reason="GEMINI_API_KEY not set",
     )
+    @pytest.mark.asyncio
     async def test_async_completion(self):
         """Test async completion."""
         client = GeminiClient(model_name="gemini-2.5-flash")
         result = await client.acompletion("What is 3+3? Reply with just the number.")
-        assert "6" in result
+        assert "6" in result