langchain Architecture Docs
Home / Class/ TestHashStrategy Class — langchain Architecture

TestHashStrategy Class — langchain Architecture

Architecture documentation for the TestHashStrategy class in test_pii.py from the langchain codebase.

Class python

Entity Profile

Dependency Diagram

graph TD
  da5ecf8c_8ef9_2bb4_25f6_02c8c2010968["TestHashStrategy"]
  6dcffc03_fae9_01f8_ed9b_d30d8a73dd13["test_pii.py"]
  da5ecf8c_8ef9_2bb4_25f6_02c8c2010968 -->|defined in| 6dcffc03_fae9_01f8_ed9b_d30d8a73dd13
  c3c876a1_c827_fae6_8692_6cb616474e79["test_hash_email()"]
  da5ecf8c_8ef9_2bb4_25f6_02c8c2010968 -->|method| c3c876a1_c827_fae6_8692_6cb616474e79
  4d0b3a60_5d5a_b1e4_d5a5_e0443cc1fe4b["test_hash_is_deterministic()"]
  da5ecf8c_8ef9_2bb4_25f6_02c8c2010968 -->|method| 4d0b3a60_5d5a_b1e4_d5a5_e0443cc1fe4b

Relationship Graph

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py lines 295–322

class TestHashStrategy:
    """Test hash strategy."""

    def test_hash_email(self) -> None:
        middleware = PIIMiddleware("email", strategy="hash")
        state = AgentState[Any](messages=[HumanMessage("Email: test@example.com")])

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

        assert result is not None
        content = result["messages"][0].content
        assert "<email_hash:" in content
        assert ">" in content
        assert "test@example.com" not in content

    def test_hash_is_deterministic(self) -> None:
        middleware = PIIMiddleware("email", strategy="hash")

        # Same email should produce same hash
        state1 = AgentState[Any](messages=[HumanMessage("Email: test@example.com")])
        state2 = AgentState[Any](messages=[HumanMessage("Email: test@example.com")])

        result1 = middleware.before_model(state1, Runtime())
        result2 = middleware.before_model(state2, Runtime())

        assert result1 is not None
        assert result2 is not None
        assert result1["messages"][0].content == result2["messages"][0].content

Defined In

Source

Frequently Asked Questions

What is the TestHashStrategy class?
TestHashStrategy is a class in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py.
Where is TestHashStrategy defined?
TestHashStrategy is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_pii.py at line 295.

Analyze Your Own Codebase

Get architecture documentation, dependency graphs, and domain analysis for your codebase in minutes.

Try Supermodel Free