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test_mask_credit_card() — langchain Function Reference

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

Function python LangChainCore ApiManagement

Entity Profile

Dependency Diagram

graph TD
  4503dffe_2185_933d_6706_fd3d9ae63af0["test_mask_credit_card()"]
  6da4bcad_d3fd_cbf4_a386_d46859fa4911["TestMaskStrategy"]
  4503dffe_2185_933d_6706_fd3d9ae63af0 -->|defined in| 6da4bcad_d3fd_cbf4_a386_d46859fa4911
  style 4503dffe_2185_933d_6706_fd3d9ae63af0 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py lines 271–281

    def test_mask_credit_card(self) -> None:
        middleware = PIIMiddleware("credit_card", strategy="mask")
        # Valid test card
        state = AgentState[Any](messages=[HumanMessage("Card: 4532015112830366")])

        result = middleware.before_model(state, Runtime())

        assert result is not None
        content = result["messages"][0].content
        assert "0366" in content  # Last 4 digits visible
        assert "4532015112830366" not in content

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Defined In

Source

Frequently Asked Questions

What does test_mask_credit_card() do?
test_mask_credit_card() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py.
Where is test_mask_credit_card() defined?
test_mask_credit_card() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py at line 271.

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