fix(tests): add url attr to AgentCard mocks in test_card_resolver

Mock(spec=AgentCard) with Pydantic v2 does not expose field attributes.
Our SSRF patch accesses agent_card.url after model_validate(), add url
and additional_interfaces to all Mock(spec=AgentCard) instances
so the attribute access succeeds.

Author: amit-raut

tests/client/test_card_resolver.py

@@ -116,7 +116,7 @@ async def test_get_agent_card_success_default_path(
         mock_httpx_client.get.return_value = mock_response
 
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ) as mock_validate:
             result = await resolver.get_agent_card()
             mock_httpx_client.get.assert_called_once_with(
@@ -141,7 +141,7 @@ async def test_get_agent_card_success_custom_path(
         mock_response.json.return_value = valid_agent_card_data
         mock_httpx_client.get.return_value = mock_response
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ):
             await resolver.get_agent_card(relative_card_path=custom_path)
 
@@ -163,7 +163,7 @@ async def test_get_agent_card_strips_leading_slash_from_relative_path(
         mock_response.json.return_value = valid_agent_card_data
         mock_httpx_client.get.return_value = mock_response
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ):
             await resolver.get_agent_card(relative_card_path=custom_path)
 
@@ -188,7 +188,7 @@ async def test_get_agent_card_with_http_kwargs(
             'headers': {'Authorization': 'Bearer token'},
         }
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ):
             await resolver.get_agent_card(http_kwargs=http_kwargs)
             mock_httpx_client.get.assert_called_once_with(
@@ -210,7 +210,7 @@ async def test_get_agent_card_root_path(
         mock_response.json.return_value = valid_agent_card_data
         mock_httpx_client.get.return_value = mock_response
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ):
             await resolver.get_agent_card(relative_card_path='/')
             mock_httpx_client.get.assert_called_once_with(f'{base_url}/')
@@ -297,7 +297,7 @@ async def test_get_agent_card_logs_success(  # noqa: PLR0913
         mock_httpx_client.get.return_value = mock_response
         with (
             patch.object(
-                AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+                AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
             ),
             caplog.at_level(logging.INFO),
         ):
@@ -321,7 +321,7 @@ async def test_get_agent_card_none_relative_path(
         mock_httpx_client.get.return_value = mock_response
 
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ):
             await resolver.get_agent_card(relative_card_path=None)
             mock_httpx_client.get.assert_called_once_with(
@@ -342,7 +342,7 @@ async def test_get_agent_card_empty_string_relative_path(
         mock_httpx_client.get.return_value = mock_response
 
         with patch.object(
-            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard)
+            AgentCard, 'model_validate', return_value=Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
         ):
             await resolver.get_agent_card(relative_card_path='')
 
@@ -373,7 +373,7 @@ async def test_get_agent_card_returns_agent_card_instance(
         """Test that get_agent_card returns an AgentCard instance."""
         mock_response.json.return_value = valid_agent_card_data
         mock_httpx_client.get.return_value = mock_response
-        mock_agent_card = Mock(spec=AgentCard)
+        mock_agent_card = Mock(spec=AgentCard, url='https://example.com/a2a', additional_interfaces=None)
 
         with patch.object(
             AgentCard, 'model_validate', return_value=mock_agent_card