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test_empty_messages() — langchain Function Reference

Architecture documentation for the test_empty_messages() function in test_pii.py from the langchain codebase.

Function python LangChainCore Runnables

Entity Profile

Dependency Diagram

graph TD
  9035ca96_dbe2_8e56_e1ca_e7151ce1798c["test_empty_messages()"]
  74acad26_e3cd_8385_fcb7_9bf787fa3f4a["TestPIIMiddlewareIntegration"]
  9035ca96_dbe2_8e56_e1ca_e7151ce1798c -->|defined in| 74acad26_e3cd_8385_fcb7_9bf787fa3f4a
  style 9035ca96_dbe2_8e56_e1ca_e7151ce1798c fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py lines 415–421

    def test_empty_messages(self) -> None:
        """Test that middleware handles empty messages gracefully."""
        middleware = PIIMiddleware("email", strategy="redact")
        state = AgentState[Any](messages=[])

        result = middleware.before_model(state, Runtime())
        assert result is None

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Defined In

Source

Frequently Asked Questions

What does test_empty_messages() do?
test_empty_messages() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py.
Where is test_empty_messages() defined?
test_empty_messages() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py at line 415.

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