test_stdoutcallback() — langchain Function Reference

Architecture documentation for the test_stdoutcallback() function in test_stdout.py from the langchain codebase.

Function python LangChainCore ApiManagement

Entity Profile

LangChainCore→ ApiManagement→ test_stdoutcallback() — langchain Function Reference

Dependency Diagram

graph TD
  b2baeede_4ae9_8697_3a9e_9324f1f649d4["test_stdoutcallback()"]
  e88cb48a_5344_bda0_2779_e219af1a998b["test_stdout.py"]
  b2baeede_4ae9_8697_3a9e_9324f1f649d4 -->|defined in| e88cb48a_5344_bda0_2779_e219af1a998b
  style b2baeede_4ae9_8697_3a9e_9324f1f649d4 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/tests/unit_tests/callbacks/test_stdout.py lines 37–47

def test_stdoutcallback(capsys: pytest.CaptureFixture) -> Any:
    """Test the stdout callback handler."""
    chain_test = FakeChain(callbacks=[StdOutCallbackHandler(color="red")])
    chain_test.invoke({"foo": "bar"})
    # Capture the output
    captured = capsys.readouterr()
    # Assert the output is as expected
    assert captured.out == (
        "\n\n\x1b[1m> Entering new FakeChain "
        "chain...\x1b[0m\n\n\x1b[1m> Finished chain.\x1b[0m\n"
    )