langchain/tests/unit_tests/llms/test_callbacks.py

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"""Test LLM callbacks."""
from langchain.chat_models.fake import FakeListChatModel
from langchain.llms.fake import FakeListLLM
from langchain.schema import HumanMessage
from tests.unit_tests.callbacks.fake_callback_handler import (
FakeCallbackHandler,
FakeCallbackHandlerWithChatStart,
)
def test_llm_with_callbacks() -> None:
"""Test LLM callbacks."""
handler = FakeCallbackHandler()
llm = FakeListLLM(callbacks=[handler], verbose=True, responses=["foo"])
output = llm("foo")
assert output == "foo"
assert handler.starts == 1
assert handler.ends == 1
assert handler.errors == 0
def test_chat_model_with_v1_callbacks() -> None:
"""Test chat model callbacks fall back to on_llm_start."""
handler = FakeCallbackHandler()
llm = FakeListChatModel(
callbacks=[handler], verbose=True, responses=["fake response"]
)
output = llm([HumanMessage(content="foo")])
assert output.content == "fake response"
assert handler.starts == 1
assert handler.ends == 1
assert handler.errors == 0
assert handler.llm_starts == 1
assert handler.llm_ends == 1
def test_chat_model_with_v2_callbacks() -> None:
"""Test chat model callbacks fall back to on_llm_start."""
handler = FakeCallbackHandlerWithChatStart()
llm = FakeListChatModel(
callbacks=[handler], verbose=True, responses=["fake response"]
)
output = llm([HumanMessage(content="foo")])
assert output.content == "fake response"
assert handler.starts == 1
assert handler.ends == 1
assert handler.errors == 0
assert handler.llm_starts == 0
assert handler.llm_ends == 1
assert handler.chat_model_starts == 1