test_run_with_callback_and_output_error() — langchain Function Reference

Architecture documentation for the test_run_with_callback_and_output_error() function in test_base.py from the langchain codebase.

Function python LangChainCore LanguageModelBase

Entity Profile

LangChainCore→ LanguageModelBase→ test_run_with_callback_and_output_error() — langchain Function Reference

Dependency Diagram

graph TD
  7197d161_bb9c_2401_1257_02d491737999["test_run_with_callback_and_output_error()"]
  cbc5b920_9825_eac5_8cc4_bc8187fb214c["test_base.py"]
  7197d161_bb9c_2401_1257_02d491737999 -->|defined in| cbc5b920_9825_eac5_8cc4_bc8187fb214c
  style 7197d161_bb9c_2401_1257_02d491737999 fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

libs/langchain/tests/unit_tests/chains/test_base.py lines 230–245

def test_run_with_callback_and_output_error() -> None:
    """Test callback manager catches run validation output error."""
    handler = FakeCallbackHandler()
    chain = FakeChain(
        the_output_keys=["foo", "bar"],
        callbacks=[handler],
    )

    with pytest.raises(
        ValueError, match=re.escape("Missing some output keys: {'foo'}")
    ):
        chain("foo")

    assert handler.starts == 1
    assert handler.ends == 0
    assert handler.errors == 1