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packages/nvidia_nat_langchain/tests/agent/test_react.py (1)

584-592: 🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

Exercise JSON ReAct responses through agent_node.

The added tests call ReActOutputParser.aparse directly. Existing agent_node tests cover text-format actions or JSON-valued Action Input, but not the new JSON object response. They also do not connect parser failures to retry/error handling.

Add boundary tests that mock _stream_llm with the JSON response, assert a valid action produces AgentDecision.TOOL, and assert missing Action Input or unusable Action values produce an error without setting final_answer.

Suggested fix

+async def test_agent_node_routes_json_object_action(mock_react_agent):
+    from unittest.mock import AsyncMock
+    from unittest.mock import patch
+
+    response = AIMessage(
+        content='{"Thought": "check", "Action": "clinical_limits", '
+                '"Action Input": {"query": "limits"}}')
+    state = ReActGraphState(messages=[HumanMessage(content="check the account")])
+
+    with patch.object(mock_react_agent, '_stream_llm', new_callable=AsyncMock) as stream:
+        stream.return_value = response
+        result = await mock_react_agent.agent_node(state)
+
+    assert result.final_answer is None
+    assert await mock_react_agent.conditional_edge(result) == AgentDecision.TOOL
+
+
+@pytest.mark.parametrize("content", [
+    '{"Thought": "check", "Action": "clinical_limits"}',
+    '{"Thought": "check", "Action": null, "Action Input": {"query": "limits"}}',
+])
+async def test_agent_node_retries_invalid_json_action(mock_react_agent_no_raise, content):
+    from unittest.mock import AsyncMock
+    from unittest.mock import patch
+
+    state = ReActGraphState(messages=[HumanMessage(content="check the account")])
+    with patch.object(mock_react_agent_no_raise, '_stream_llm', new_callable=AsyncMock) as stream:
+        stream.side_effect = lambda *args, **kwargs: AIMessage(content=content)
+        result = await mock_react_agent_no_raise.agent_node(state)
+
+    assert result.final_answer is None
+    assert content in result.messages[-1].content

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Review comment at @packages/nvidia_nat_langchain/tests/agent/test_react.py
around lines 584 - 592:
Add boundary tests for JSON ReAct responses through `agent_node`, mocking
`_stream_llm` to verify a valid action returns `AgentDecision.TOOL` without
setting `final_answer`. Also cover missing `Action Input` and unusable `Action`
values, asserting the existing retry/error path reports the response and leaves
`final_answer` unset.

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