test_anthropic_streaming_callback() — langchain Function Reference

Source Code

libs/partners/anthropic/tests/integration_tests/test_chat_models.py lines 365–378

def test_anthropic_streaming_callback() -> None:
    """Test that streaming correctly invokes on_llm_new_token callback."""
    callback_handler = FakeCallbackHandler()
    callback_manager = CallbackManager([callback_handler])
    chat = ChatAnthropic(
        model=MODEL_NAME,  # type: ignore[call-arg]
        callbacks=callback_manager,
        verbose=True,
    )
    message = HumanMessage(content="Write me a sentence with 10 words.")
    for token in chat.stream([message]):
        assert isinstance(token, AIMessageChunk)
        assert isinstance(token.content, str)
    assert callback_handler.llm_streams > 1