clarify purpose of test

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: mwri

tests/client/test_card_resolver.py

@@ -224,7 +224,7 @@ async def test_get_agent_card_with_empty_resolver_agent_card_path(
         mock_response,
         valid_agent_card_data,
     ):
-        """Test fetching agent card with an empty relative_card_path."""
+        """Test fetching agent card when the resolver's agent_card_path is empty."""
         resolver.agent_card_path = ''
         mock_response.json.return_value = valid_agent_card_data
         mock_httpx_client.get.return_value = mock_response